substr

(PHP 4, PHP 5)

substrRestituisce parte di una stringa

Descrizione

string substr ( string $string , int $start [, int $length ] )

La funzione substr() restituisce la porzione di string indicata dai parametri start e length.

Se start non è negativo, la stringa restituita inizierà dalla posizione start di string, partendo da zero. Ad esempio, nella stringa 'abcdef', il carattere alla posizione 0 è 'a', il carattere alla posizione 2 è 'c', e così via.

Example #1 Esempi di base di substr()

<?php
echo substr('abcdef'1);     // bcdef
echo substr('abcdef'13);  // bcd
echo substr('abcdef'04);  // abcd
echo substr('abcdef'08);  // abcdef
echo substr('abcdef', -11); // f

// Accedere al singolo carattere
//  tramite le parentesi graffe è un'altra possibilità
$string 'abcdef';
echo 
$string{0};                 // a
echo $string{3};                 // d
echo $string{strlen($string)-1}; // f
?>

Se start è negativo, la stringa restituita inizierà dal carattere start dalla fine di string.

Example #2 Utilizzo di valori negativi di start

<?php
$rest 
substr("abcdef", -1);    // restituisce "f"
$rest substr("abcdef", -2);    // restituisce "ef"
$rest substr("abcdef", -31); // restituisce "d"
?>

Se length è indicato ed è positivo, la stringa restituita conterrà almeno length caratteri partendo da start (in base alla lunghezza di string). Se string è minore o uguale a start, la funzione restituisce FALSE

Se length è indicato ed è negativo, allora saranno omessi length caratteri dalla fine di string (dopo avere calcolato la posizione iniziale, nel caso in cui start sia negativo). Se start indica una posizione successiva a questo troncamento, la funzione restituirà una stringa vuota.

Example #3 Utilizzo di valori negativi per length

<?php
$rest 
substr("abcdef"0, -1);  // returns "abcde"
$rest substr("abcdef"2, -1);  // returns "cde"
$rest substr("abcdef"4, -4);  // returns ""
$rest substr("abcdef", -3, -1); // returns "de"
?>

Vedere anche strrchr(), substr_replace(), ereg(), trim(), mb_substr() e wordwrap().

add a note add a note

User Contributed Notes 63 notes

up
36
Andreas Bur (andreas dot buro at gmail dot com)
5 years ago
For getting a substring of UTF-8 characters, I highly recommend mb_substr

<?php
        $utf8string
= "cakeæøå";

        echo
substr($utf8string,0,5);
       
// output cake#
       
echo mb_substr($utf8string,0,5,'UTF-8');
       
//output cakeæ
?>
up
21
biohazard dot ge at gmail dot com
1 year ago
may be by following functions will be easier to extract the needed sub parts from a string:

<?php
after
('@', 'biohazard@online.ge');
//returns 'online.ge'
//from the first occurrence of '@'

before ('@', 'biohazard@online.ge');
//returns 'biohazard'
//from the first occurrence of '@'

between ('@', '.', 'biohazard@online.ge');
//returns 'online'
//from the first occurrence of '@'

after_last ('[', 'sin[90]*cos[180]');
//returns '180]'
//from the last occurrence of '['

before_last ('[', 'sin[90]*cos[180]');
//returns 'sin[90]*cos['
//from the last occurrence of '['

between_last ('[', ']', 'sin[90]*cos[180]');
//returns '180'
//from the last occurrence of '['
?>

here comes the source:

<?php

   
function after ($this, $inthat)
    {
        if (!
is_bool(strpos($inthat, $this)))
        return
substr($inthat, strpos($inthat,$this)+strlen($this));
    };

    function
after_last ($this, $inthat)
    {
        if (!
is_bool(strrevpos($inthat, $this)))
        return
substr($inthat, strrevpos($inthat, $this)+strlen($this));
    };

    function
before ($this, $inthat)
    {
        return
substr($inthat, 0, strpos($inthat, $this));
    };

    function
before_last ($this, $inthat)
    {
        return
substr($inthat, 0, strrevpos($inthat, $this));
    };

    function
between ($this, $that, $inthat)
    {
        return
before ($that, after($this, $inthat));
    };

    function
between_last ($this, $that, $inthat)
    {
     return
after_last($this, before_last($that, $inthat));
    };

// use strrevpos function in case your php version does not include it
function strrevpos($instr, $needle)
{
   
$rev_pos = strpos (strrev($instr), strrev($needle));
    if (
$rev_pos===false) return false;
    else return
strlen($instr) - $rev_pos - strlen($needle);
};
?>
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18
slow at acedsl dot com
3 years ago
Anyone coming from the Python world will be accustomed to making substrings by using a "slice index" on a string.  The following function emulates basic Python string slice behavior. (A more elaborate version could be made to support array input as well as string, and the optional third "step" argument.)

<?php

function py_slice($input, $slice) {
   
$arg = explode(':', $slice);
   
$start = intval($arg[0]);
    if (
$start < 0) {
       
$start += strlen($input);
    }
    if (
count($arg) === 1) {
        return
substr($input, $start, 1);
    }
    if (
trim($arg[1]) === '') {
        return
substr($input, $start);
    }
   
$end = intval($arg[1]);
    if (
$end < 0) {
       
$end += strlen($input);
    }
    return
substr($input, $start, $end - $start);
}

print
py_slice('abcdefg', '2') . "\n";
print
py_slice('abcdefg', '2:4') . "\n";
print
py_slice('abcdefg', '2:') . "\n";
print
py_slice('abcdefg', ':4') . "\n";
print
py_slice('abcdefg', ':-3') . "\n";
print
py_slice('abcdefg', '-3:') . "\n";

?>

The $slice parameter can be a single character index, or a range separated by a colon. The start of the range is inclusive and the end is exclusive, which may be  counterintuitive. (Eg, py_slice('abcdefg', '2:4') yields 'cd' not 'cde'). A negative range value means to count from the end of the string instead of the beginning. Both the start and end of the range may be omitted; the start defaults to 0 and the end defaults to the total length of the input.

The output from the examples:
c
cd
cdefg
abcd
abcd
efg
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6
morgangalpin att gmail dotty com
7 years ago
Adding the $limit parameter introduced a bug that was not present in the original. If $limit is small or negative, a string with a length exceeding the limit can be returned. The $limit parameter should be checked. It takes slightly more processing, but it is dwarfed in comparison to the use of strlen().

<?php
 
function short_name($str, $limit)
  {
   
// Make sure a small or negative limit doesn't cause a negative length for substr().
   
if ($limit < 3)
    {
     
$limit = 3;
    }

   
// Now truncate the string if it is over the limit.
   
if (strlen($str) > $limit)
    {
      return
substr($str, 0, $limit - 3) . '...';
    }
    else
    {
      return
$str;
    }
  }
?>
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2
webmaster at oehoeboeroe dot nl
5 years ago
You might expect substr('123456', 6) to return an empty string. Instead it returns boolean FALSE.

This behavior should be mentioned in the Return Values section of the manual. Instead it is only mentioned in the Parameters section.

If you need an empty string instead of a boolean FALSE you should typecast the result to a string.

<?php
$a
= substr('123456', 6);              // equivalent to $a = FALSE
$a = (string) substr('123456', 6);   // equivalent to $a = '';
?>
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2
post [at] jannik - zappe [dot] de
6 years ago
Just a little function to cut a string by the wanted amount. Works in both directions.

<?php
function cutString($str, $amount = 1, $dir = "right")
{
  if((
$n = strlen($str)) > 0)
  {
    if(
$dir == "right")
    {
     
$start = 0;
     
$end = $n-$amount;
    } elseif(
$dir == "left") {
     
$start = $amount;
     
$end = $n;
    }
   
    return
substr($str, $start, $end);
  } else return
false;
}
?>

Enjoy ;)
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3
Nadeem
5 months ago
Truncate a float number. Similar to the Excel trunc function.

<?php
function truncate_number($val,$decimals=2){
   
       
$number=array();
       
$number=explode(".",$val);           
       
$result=0;

        if (
count($number)>1){

           
$result = $number[0] . "." . substr($number[1],0,$decimals); 
           
        } else {
       
           
$result = $val;
           
        }               

        unset(
$number);

        return
$result;   
}

echo
truncate_number(99.123456,2); //result = 99.12
echo truncate_number(99.123456,5); //result = 99.12345
echo truncate_number(99.123456,1); //result = 99.1
?>
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9
mar dot czapla at gmail dot com
6 years ago
Here we have gr8 function which simply convert ip address to a number using substr with negative offset.
You can need it if you want to compare some IP addresses converted to a numbers.
For example when using ip2country, or eliminating same range of ip addresses from your website :D

<?php

function ip2no($val)
{   
    list(
$A,$B,$C,$D)    =    explode(".",$val);
    return
       
substr("000".$A,-3).
       
substr("000".$B,-3).
       
substr("000".$C,-3).
       
substr("000".$D,-3);
}

$min        =    ip2no("10.11.1.0");
$max        =    ip2no("111.11.1.0");
$visitor    =    ip2no("105.1.20.200");

if(
$min<$visitor && $visitor<$max)   
    {    echo
'Welcome !';    }
else   
    {    echo
'Get out of here !';    }

?>
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8
fanfatal at fanfatal dot pl
9 years ago
Hmm ... this is a script I wrote, whitch is very similar to substr, but it isn't takes html and bbcode for counting and it takes portion of string and show avoided (html & bbcode) tags too ;]
Specially usefull for show part of serach result included html and bbcode tags

<?php

/**
* string csubstr ( string string, int start [, int length] )
*
* @author FanFataL
* @param string string
* @param int start
* @param [int length]
* @return string
*/
function csubstr($string, $start, $length=false) {
   
$pattern = '/(\[\w+[^\]]*?\]|\[\/\w+\]|<\w+[^>]*?>|<\/\w+>)/i';
   
$clean = preg_replace($pattern, chr(1), $string);
    if(!
$length)
       
$str = substr($clean, $start);
    else {
       
$str = substr($clean, $start, $length);
       
$str = substr($clean, $start, $length + substr_count($str, chr(1)));
    }
   
$pattern = str_replace(chr(1),'(.*?)',preg_quote($str));
    if(
preg_match('/'.$pattern.'/is', $string, $matched))
        return
$matched[0];
    return
$string;
}

?>

Using this is similar to simple substr.

Greatings ;]
...
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8
pugazhenthi k
1 year ago
<?Php

### SUB STRING  BY WORD USING substr() and strpos()  #####

### THIS SCRIPT WILL RETURN PART OF STRING  WITHOUT WORD BREAK ###

$description = ‘your description here your description here your description here your description here your description here your description here your description hereyour description here your description here’  // your description here .

$no_letter = 30 ;

if(
strlen($desctiption) > 30 )
{
     echo
substr($description,0,strpos($description,’ ‘,30));             //strpos to find ‘ ‘ after 30 characters.
}
else {
     echo
$description;
}

?>
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4
woutermb at gmail dot com
9 years ago
Well this is a script I wrote, what it does is chop up long words with malicious meaning into several parts. This way, a chat in a table will not get stretched anymore.

<?php

function text($string,$limit=20,$chop=10){

$text = explode(" ",$string);
while(list(
$key, $value) = each($text)){
   
$length = strlen($value);
    if(
$length >=20){
        for(
$i=0;$i<=$length;$i+=10){
           
$new .= substr($value, $i, 10);
           
$new .= " ";
        }
        
$post .= $new;
    }
    elseif(
$length <=15){
       
$post .= $value;
    }
   
$post .= " ";
}
return(
$post);
}

// for example, this would return:
$output = text("Well this text doesn't get cut up, yet thisssssssssssssssssssssssss one does.", 10, 5);

echo(
$output); // "Well this text doesn't get cup up, yet thiss sssss sssss sssss sssss sss one does."
?>

I hope it was useful.. :)
up
7
frank at jkelloggs dot dk
9 years ago
Regarding the utf8_substr function from lmak: The pattern '/./u' doesn't match newline characters. This means that the substring from 0 to the total length of the string will miss the number of characters in the end matching the number of newlines in the string. To fix this one can add the s modifier (PCRE_DOTALL) in the pattern:

<?php
function utf8_substr($str,$start)
{
  
preg_match_all("/./su", $str, $ar);

   if(
func_num_args() >= 3) {
      
$end = func_get_arg(2);
       return
join("",array_slice($ar[0],$start,$end));
   } else {
       return
join("",array_slice($ar[0],$start));
   }
}
?>
up
5
Petez
7 years ago
I wanted to work out the fastest way to get the first few characters from a string, so I ran the following experiment to compare substr, direct string access and strstr:

<?php
/* substr access */
beginTimer();
for (
$i = 0; $i < 1500000; $i++){
   
$opening = substr($string,0,11);
    if (
$opening == 'Lorem ipsum'){
       
true;
    }else{
       
false;
    }
}
$endtime1 = endTimer();

/* direct access */
beginTimer();
for (
$i = 0; $i < 1500000; $i++){
    if (
$string[0] == 'L' && $string[1] == 'o' && $string[2] == 'r' && $string[3] == 'e' && $string[4] == 'm' && $string[5] == ' ' && $string[6] == 'i' && $string[7] == 'p' && $string[8] == 's' && $string[9] == 'u' && $string[10] == 'm'){
       
true;
    }else{
       
false;
    }
}
$endtime2 = endTimer();

/* strstr access */
beginTimer();
for (
$i = 0; $i < 1500000; $i++){
   
$opening = strstr($string,'Lorem ipsum');
    if (
$opening == true){
       
true;
    }else{
       
false;
    }
}
$endtime3 = endTimer();

echo
$endtime1."\r\n".$endtime2."\r\n".$endtime3;
?>

The string was 6 paragraphs of Lorem Ipsum, and I was trying match the first two words. The experiment was run 3 times and averaged. The results were:

(substr) 3.24
(direct access) 11.49
(strstr) 4.96

(With standard deviations 0.01, 0.02 and 0.04)

THEREFORE substr is the fastest of the three methods for getting the first few letters of a string.
up
3
fatihmertdogancan at hotmail dot com
10 months ago
[English]
I created python similar accesing list or string with php substr & strrev functions.

Use: str($string,$pattern)

About the python pattern,
http://docs.python.org/release/1.5.1p1/tut/strings.html
http://effbot.org/zone/python-list.htm

About of pattern structures
[start:stop:step]

Example,
<?php
$s
= "fatihmertdogancan";
echo
str($s,"1:9:-2");
echo
"<br/>";
echo
str($s,"1:-3:-2");
echo
"<br/>";
echo
str($s,"1:-11:-5");
echo
"<br/>";
echo
str($s,"1:9:4");
?>

Output,
thetoacn
eht
aom
htan

This is function phpfiddle link: http://phpfiddle.org/main/code/e82-y5d

or source;

<?php
   
function str($str,$pattern){
       
//[start:stop:step]
        //pattern ->            ([-]?[0-9]*|\s):([-]?[0-9]*|\s):([-]?[0-9]*|\s)
       
preg_match("/([-]?[0-9]*|\s?):([-]?[0-9]*|\s?):?([-]?[0-9]*|\s?)/", $pattern, $yakala);
       
$start = $yakala[1];
       
$stop = $yakala[2];
       
$step = $yakala[3];
       
        if(empty(
$start) && empty($stop) && $step == "-1"){//istisna durum
           
return strrev($str);
        }else if(empty(
$start) && empty($stop) && isset($step)){//istisna durum
           
$rev = "";
           
$yeni = "";
            if(
$step[0] == "-" && $stop != "-1"){$rev = "VAR";}
           
$atla = abs($step);
            for(
$i = 0; $i <= strlen($str); $i++){
               
$offset = $i*$atla;
                if(isset(
$str[$offset])){
                   
$yeni = $yeni.$str[$offset];
                }
            }
            if(
$rev != "VAR"){
                return
substr($yeni,0,strlen($str)-1);
               
//"hepsi boş, step dolu o da +";
           
}else{
                return
strrev(substr($yeni,0,strlen($str)-1));
               
//"hepsi boş, step dolu o da -";
           
}
        }
       
        if(empty(
$start) && empty($stop) && empty($step)){
            return
$str;
           
//"hepsi boş";
       
}else if(empty($start)){
            if(isset(
$stop) && empty($step)){
               
$rev = "";
                if(
$stop[0] == "-"){$rev = "VAR";}
                if(
$rev != "VAR"){
                    return
substr($str,0,$stop);
                   
//"start ve step boş, stop dolu"
               
}else{
                    return
strrev(substr($str,0,$stop));
                   
//"start ve step boş, stop -1";
               
}
            }else if(isset(
$stop) && isset($step)){
               
$rev = "";
                if(
$stop[0] == "-"){$rev = "VAR";}
               
$yeni = "";
                if(
$step == 1){
                    if(
$rev != "VAR"){
                        return
$str;
                       
//"start boş, stop ve step dolu, step 1";
                   
}else{
                        return
strrev(substr($str,0,abs($stop))); //abs -> mutlak değer (-5 = 5)
                        //"start boş, stop -, step dolu, step 1";
                   
}
                }else{
                   
$atla = abs($step);
                    for(
$i = 0; $i <= strlen($str); $i++){
                       
$offset = $i*$atla;
                        if(isset(
$str[$offset])){
                           
$yeni = $yeni.$str[$offset];
                        }
                    }
                    if(
$rev != "VAR"){
                        return
substr($yeni,0,$stop);
                       
//"start boş, step ve stop dolu";
                   
}else{
                        return
strrev(substr($yeni,0,abs($stop)));
                       
//"start boş, step ve stop -";
                   
}
                }
            }
       
//start boş değilse
       
}else if(!empty($start)){
            if(isset(
$stop) && empty($step)){
               
$rev = "";
                if(
$stop[0] == "-"){$rev = "VAR";}
                if(
$rev != "VAR"){
                    return
substr($str,$start,$stop);
                   
//return "step boş, start ve stop dolu";
               
}else{
                    return
strrev(substr($str,0,abs($stop)));
                   
//"step boş, start ve stop dolu, stop -";
               
}
            }else if(isset(
$stop) && isset($step)){
               
               
//hepsi dolu
               
$rev = "";
                if(
$stop[0] == "-"){$rev = "VAR";}
               
$yeni = "";
                if(
$step == 1){
                    if(
$rev != "VAR"){
                        return
substr($str,$start,$stop);
                       
//"hepsi dolu, step 1";
                   
}else{
                        return
substr($str,$start,abs($stop));
                       
//"hepsi dolu, step 1, stop -";
                   
}
                }else{
                    if(
$stop[0] == "-"){$rev = "VAR";}
                   
$atla = abs($step);
                    for(
$i = 0; $i <= strlen($str); $i++){
                       
$offset = $i*$atla;
                        if(isset(
$str[$offset])){
                           
$yeni = $yeni.$str[$offset];
                        }
                    }
                    if(
$rev != "VAR"){
                        return
substr($yeni,$start,$stop);
                       
//"hepsi dolu";
                   
}else{
                        return
strrev(substr($yeni,$start,abs($stop)));
                       
//"hepsi dolu, stop -";
                   
}
                }
            }
        }
    }
?>

Good works..
up
5
Bradley from California
8 years ago
Add on to (a function originally written by) "Matias from Argentina": str_format_number function.

Just added handling of $String shorter then $Format by adding a side to start the fill and a string length to the while loop.

<?php
function str_format_number($String, $Format, $Start = 'left'){
   
//If we want to fill from right to left incase string is shorter then format
   
if ($Start == 'right') {
       
$String = strrev($String);
       
$Format = strrev($Format);
    }
    if(
$Format == '') return $String;
    if(
$String == '') return $String;   
   
$Result = '';
   
$FormatPos = 0;
   
$StringPos = 0;
    while ((
strlen($Format) - 1) >= $FormatPos && strlen($String) > $StringPos) {
       
//If its a number => stores it
       
if (is_numeric(substr($Format, $FormatPos, 1))) {
           
$Result .= substr($String, $StringPos, 1);
           
$StringPos++;
           
//If it is not a number => stores the caracter
       
} else {
           
$Result .= substr($Format, $FormatPos, 1);
        }
       
//Next caracter at the mask.
       
$FormatPos++;
    }
    if (
$Start == 'right') $Result = strrev($Result);
    return
$Result;
}
?>
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3
ivanhoe011 at gmail dot com
9 years ago
If you need just a single character from the string you don't need to use substr(), just use curly braces notation:

<?php
   
// both lines will output the 3rd character
   
echo substr($my_string, 2, 1);
    echo
$my_string{2}; 
?>

curly braces syntax is faster and more readable IMHO..
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3
rob NOSPAM at clancentric dot net
9 years ago
I have developed a function with a similar outcome to jay's

Checks if the last character is or isnt a space. (does it the normal way if it is)
It explodes the string into an array of seperate works, the effect is... it chops off anything after and including the last space.

<?php
function limit_string($string, $charlimit)
{
    if(
substr($string,$charlimit-1,1) != ' ')
    {
       
$string = substr($string,'0',$charlimit);
       
$array = explode(' ',$string);
       
array_pop($array);
       
$new_string = implode(' ',$array);

        return
$new_string.'...';
    }
    else
    {   
        return
substr($string,'0',$charlimit-1).'...';
    }
}
?>
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1
joseph dot davidson dot 707 at gmail dot com
4 years ago
Using substr() to examine characters of a string without altering the string.

<?php
$string
= 'This is my string';
$length = strlen($string);
$myChar = 'm';

for(
$i = 0; $i < $length; $i++) {

   
$showString_i = substr($string, $i, 1);
    if(
$myChar == $showString_i) return $i;
}
?>

can also examine subs.
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3
pheagey at gmail dot com
2 years ago
Using a 0 as the last parameter for substr().

As per examples
<?php $var = substr($var, 4); ?>

works no problem. However
<?php $var = substr($var, 4, 0); ?>

will get you nothing. Just a quick heads up
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3
steve at unicycle dot co dot nz
9 years ago
To quickly trim an optional trailing slash off the end of a path name:

if (substr( $path, -1 ) == '/') $path = substr( $path, 0, -1 );
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4
vnonov at gmail dot com / Viktor Nonov
4 years ago
<?php

//removes string from the end of other

function removeFromEnd($string, $stringToRemove) {
   
$stringToRemoveLen = strlen($stringToRemove);
   
$stringLen = strlen($string);
   
   
$pos = $stringLen - $stringToRemoveLen;

   
$out = substr($string, 0, $pos);

    return
$out;
}

$string = 'picture.jpg.jpg';
$string = removeFromEnd($string, '.jpg');
?>
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3
Cristianlf
4 years ago
I needed a function like lpad from oracle, or right from SQL
then I use this code :

<?php
function right($string,$chars)
{
   
$vright = substr($string, strlen($string)-$chars,$chars);
    return
$vright;
   
}

    echo
right('0r0j4152',4);
?>

Result:
4152
------------------------------------------------
This function is really simple, I just wanted to share, maybe helps someone out there. 

regards,
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1
magickey
4 years ago
Simple UTF-8 Multibyte solution (without mb_substr)

<?php
  $string
="texto en español";
  echo
substr($string,0,14); //Outputs: texto en espa�
?>

<?php
  $string
="texto en español";
  echo
utf8_encode(substr(utf8_decode($string),0,14)); //Outputs: texto en españ
?>
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1
biner(gf)
5 years ago
<?php
//substring without words breaking

$str = "aa bb ccc ddd ee fff gg hhh iii";

echo
substr(($str=wordwrap($str,$,'$$')),0,strpos($str,'$$'));
?>
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1
egingell at sisna dot com
8 years ago
<?php

/**
* string substrpos(string $str, mixed $start [[, mixed $end], boolean $ignore_case])
*
* If $start is a string, substrpos will return the string from the position of the first occuring $start to $end
*
* If $end is a string, substrpos will return the string from $start to the position of the first occuring $end
*
* If the first character in (string) $start or (string) $end is '-', the last occuring string will be used.
*
* If $ignore_case is true, substrpos will not care about the case.
* If $ignore_case is false (or anything that is not (boolean) true, the function will be case sensitive.
*        Both of the above: only applies if either $start or $end are strings.
*
* echo substrpos('This is a string with 0123456789 numbers in it.', 5, '5');
*        // Prints 'is a string with 01234';
*
* echo substrpos('This is a string with 0123456789 numbers in it.', '5', 5);
*        // Prints '56789'
*
* echo substrpos('This is a string with 0123456789 numbers in it and two strings.', -60, '-string')
*        // Prints 's is a string with 0123456789 numbers in it and two '
*
* echo substrpos('This is a string with 0123456789 numbers in it and two strings.', -60, '-STRING', true)
*        // Prints 's is a string with 0123456789 numbers in it and two '
*
* echo substrpos('This is a string with 0123456789 numbers in it and two strings.', -60, '-STRING', false)
*        // Prints 's is a string with 0123456789 numbers in it and two strings.'
*
* Warnings:
*        Since $start and $end both take either a string or an integer:
*            If the character or string you are searching $str for is a number, pass it as a quoted string.
*        If $end is (integer) 0, an empty string will be returned.
*        Since this function takes negative strings ('-search_string'):
*            If the string your using in $start or $end is a '-' or begins with a '-' escape it with a '\'.
*            This only applies to the *first* character of $start or $end.
*/

// Define stripos() if not defined (PHP < 5).
if (!is_callable("stripos")) {
    function
stripos($str, $needle, $offset = 0) {
        return
strpos(strtolower($str), strtolower($needle), $offset);
    }
}

function
substrpos($str, $start, $end = false, $ignore_case = false) {
   
// Use variable functions
   
if ($ignore_case === true) {
       
$strpos = 'stripos'; // stripos() is included above in case it's not defined (PHP < 5).
   
} else {
       
$strpos = 'strpos';
    }

   
// If end is false, set it to the length of $str
   
if ($end === false) {
       
$end = strlen($str);
    }

   
// If $start is a string do what's needed to make it an integer position for substr().
   
if (is_string($start)) {
       
// If $start begins with '-' start processing until there's no more matches and use the last one found.
       
if ($start{0} == '-') {
           
// Strip off the '-'
           
$start = substr($start, 1);
           
$found = false;
           
$pos = 0;
            while((
$curr_pos = $strpos($str, $start, $pos)) !== false) {
               
$found = true;
               
$pos = $curr_pos + 1;
            }
            if (
$found === false) {
               
$pos = false;
            } else {
               
$pos -= 1;
            }
        } else {
           
// If $start begins with '\-', strip off the '\'.
           
if ($start{0} . $start{1} == '\-') {
               
$start = substr($start, 1);
            }
           
$pos = $strpos($str, $start);
        }
       
$start = $pos !== false ? $pos : 0;
    }

   
// Chop the string from $start to strlen($str).
   
$str = substr($str, $start);

   
// If $end is a string, do exactly what was done to $start, above.
   
if (is_string($end)) {
        if (
$end{0} == '-') {
           
$end = substr($end, 1);
           
$found = false;
           
$pos = 0;
            while((
$curr_pos = strpos($str, $end, $pos)) !== false) {
               
$found = true;
               
$pos = $curr_pos + 1;
            }
            if (
$found === false) {
               
$pos = false;
            } else {
               
$pos -= 1;
            }
        } else {
            if (
$end{0} . $end{1} == '\-') {
               
$end = substr($end, 1);
            }
           
$pos = $strpos($str, $end);
        }
       
$end = $pos !== false ? $pos : strlen($str);
    }

   
// Since $str has already been chopped at $start, we can pass 0 as the new $start for substr()
   
return substr($str, 0, $end);
}

?>
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2
sajjad at sajjad dot biz
5 years ago
Substring utf-8 strings!
very simple!

<?php
function substru($str,$from,$len){
    return
preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'. $from .'}'.'((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'. $len .'}).*#s','$1', $str);
}
?>
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1
link
5 years ago
I created some functions for entity-safe splitting+lengthcounting:

<?php
function strlen_entities($text)
{
   
preg_match_all(
       
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.        
       
'(?:&(?!\w;)))s',$text,$textarray);
    return
count($textarray[0]);

function
substr_entities($text,$start,$limit=0)
{
   
$return = '';
   
preg_match_all(
       
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.        
       
'(?:&(?!\w;)))s',$text,$textarray);
   
$textarray = $textarray[0];
   
$numchars = count($textarray)-1;
    if (
$start>=$numchars)
        return
false;
    if (
$start<0)
    {
       
$start = ($numchars)+$start+1;
    }
    if (
$start>=0)
    {
        if (
$limit==0)
        {
           
$end=$numchars;
        }
        elseif (
$limit>0)
        {
           
$end = $start+($limit-1);
        }
        else
        {
           
$end = ($numchars)+$limit;
        }

        for (
$i=$start;$i<=$end;$i++)
        {
           
$return .= $textarray[$i];
        }
        return
$return;
    }
}
?>
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0
jjanak at webperfection dot net
1 month ago
interesting and maybe not so obvious behavior:

print substr('\\test', 2); // est
print substr('\\test',1); // test

if you take a closer look you will realize that the backslash was escaped, still i think it's interesting to mention :)
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0
goren dot ali at NOSPAM dot yandex dot com
2 months ago
II use my random password generator class

<?php
/*
  * Ali GOREN
  *
  *
*/

class SifreOlusturucu {

   
//var $boyut; test

   
function __construct($boyut = 8) { // 8 default, 14 or more good and recommended length
       
$this->boyut = $boyut;
    }

    function
sifreOlustur() {
       
//$this->boyut;
       
$karakterler = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_-=+;:,.?';
       
$sifre = substr( str_shuffle( $karakterler ), 0, $this->boyut);
       
print_r($sifre);
    }
}

$olustur = new SifreOlusturucu(16);
$olustur->sifreOlustur(); // output: wIsLiXzH1uP@hqSm
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0
Anonymous
3 months ago
substr() exhibits rather unexpected behavior with respect to when it returns "" and when it returns FALSE.  Specifically, the following appears to hold (tested on PHP 5.4.19):

*  if $string is "", it always returns FALSE

*  if ($start >= 0) and ($start >= strlen($string)) it returns FALSE

*  if ($start >= 0) and ($length<($start - strlen($string))) it returns FALSE

*  if ($start < 0) then it returns FALSE if *and only if* $length<-strlen($string).

No other cases return FALSE.
Note that in the last case, the position indicated by $start doesn't actually matter!

Also worth noting is that if you supply a $start that is < -strlen($string), it will be treated exactly as if you had set $start = strlen($string).

Here are some test cases to illustrate this behavior:

substr("",0,0) === FALSE
substr("",0,4) === FALSE
substr("",-2,4) === FALSE

substr("abc",3,0) === FALSE
substr("abc",3,10) === FALSE
substr("abc",3,-1) === FALSE
substr("abc",0,-4) === FALSE
substr("abc",2,-2) === FALSE
substr("abc",-1,-4) === FALSE
substr("abc",-4,-4) === FALSE
substr("abc",-5,-4) === FALSE
substr("abc",-10,-5) === FALSE

substr("abc",-10,-2) === "a"
substr("abc",-1,-3) === ""
substr("abc",-1,-2) === ""
substr("abc",-2,-3) === ""
substr("abc",0,0) === ""
substr("abc",-3,0) === ""
substr("abc",-10,0) === ""
substr("abc",-3,4) === "abc"
substr("abc",-10,20) === "abc"
substr("abc",-2,-2) === ""
substr("abc",-2,1) === "b"
substr("abc",0,-3) === ""
substr("abc",2,-1) === ""
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0
php at richardneill dot org
7 months ago
Frequently we want to check whether one string ends with (or starts with) another.  These may be useful:

function str_ends($string,$end){
    return (substr($string,-strlen($end),strlen($end)) === $end);
}   
function str_begins($string,$start){
    return (substr($string,0,strlen($start)) === $start);
}   

Example:
if (str_ends ($filename, ".jpg")){
   echo "The extension is .jpg";
}
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0
koczkahun at gmail dot com
8 months ago
For those who cannot use mb_substr for any reasons, here is a solution for Unicode strings:

function substr_unicode($str, $s, $l = null)
{
    $r = '/^.{'.(int)$s.'}(.';
    $r .= ($l === null) ? '*)$' : '{'.(int)$l.'})';
    $r .= '/su';
    preg_match($r, $str, $o); return $o[1];
}

It is EXTREMELY fast compared to the array_slice + join method suggested before, and moderately slower than mb_substr.

Note: you cannot use negative values.
Note 2: use mb_substr whenever you can. Only use this workaround if you can not use the library.
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0
leon weidauer
3 years ago
When using a value of a wrong type as second parameter , substr() does not return FALSE but NULL although the docs say, it should return FALSE on error.

Prior to PHP 5.3, substr() tries to cast the second parameter to int and doesn't throw any errors. Since PHP 5.3 a warning is thrown.
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0
nikolai dot wuestemann at t-online dot de
3 years ago
If you want to have a string BETWEEN two strings, just use this function:

<?php
function get_between($input, $start, $end)
{
 
$substr = substr($input, strlen($start)+strpos($input, $start), (strlen($input) - strpos($input, $end))*(-1));
  return
$substr;
}

//Example:

$string = "123456789";
$a = "12";
$b = "9";

echo
get_between($string, $a, $b);

//Output:
//345678
?>
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1
feedback at realitymedias dot com
8 years ago
This function can replace substr() in some situations you don't want to cut right in the middle of a word. strtrim will cut between words when it is possible choosing the closest possible final string len to return. the maxoverflow parameter lets you choose how many characters can overflow past the maxlen parameter.

<?php

function strtrim($str, $maxlen=100, $elli=NULL, $maxoverflow=15) {
    global
$CONF;
       
    if (
strlen($str) > $maxlen) {
           
        if (
$CONF["BODY_TRIM_METHOD_STRLEN"]) {
            return
substr($str, 0, $maxlen);
        }
           
       
$output = NULL;
       
$body = explode(" ", $str);
       
$body_count = count($body);
       
       
$i=0;
   
        do {
           
$output .= $body[$i]." ";
           
$thisLen = strlen($output);
           
$cycle = ($thisLen < $maxlen && $i < $body_count-1 && ($thisLen+strlen($body[$i+1])) < $maxlen+$maxoverflow?true:false);
           
$i++;
        } while (
$cycle);
        return
$output.$elli;
    }
    else return
$str;
}

?>
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0
kaj dot strom at kapsi dot fi
5 years ago
One thing to keep in mind when using string indexes and UTF-8 is that string indexes are NOT multi-byte safe.

<?php
$string
= 'äää1';
echo
$string[3];
?>

Outputs:
¤

When it logically should output "1". This is not a bug, as PHP 'normal' string functions are not intended to be multi-byte safe. This can be solved by using this function

<?php
/**
*
* @param string $string String to "search" from
* @param int $index Index of the letter we want.
* @return string The letter found on $index.
*/
function charAt($string, $index){
    if(
$index < mb_strlen($string)){
        return
mb_substr($string, $index, 1);
    }
    else{
        return -
1;
    }
}
?>
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0
gkhelloworld at gmail dot com
5 years ago
Shortens the filename and its expansion has seen.

<?php
$file
= "Hellothisfilehasmorethan30charactersandthisfayl.exe";

function
funclongwords($file)
{
if (
strlen($file) > 30)
{
$vartypesf = strrchr($file,".");
$vartypesf_len = strlen($vartypesf);
$word_l_w = substr($file,0,15);
$word_r_w = substr($file,-15);
$word_r_a = substr($word_r_w,0,-$vartypesf_len);

return
$word_l_w."...".$word_r_a.$vartypesf;
}
else
return
$file;
}
// RETURN: Hellothisfileha...andthisfayl.exe
?>
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0
kaysar in ymail in com
5 years ago
Drop extensions of a file (even from a file location string)

<?php

$filename
= "c:/some dir/abc defg. hi.jklmn";

echo
substr($filename, 0, (strlen ($filename)) - (strlen (strrchr($filename,'.'))));

?>

output: c:/some dir/abc defg. hi

Hope it may help somebody like me.. (^_^)
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0
link
5 years ago
And as always there is bound to be a bug:

<?php
function strlen_entities($text)
{
   
preg_match_all(
       
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.       
       
'(?:&(?!\w;)))s',$text,$textarray);
    return
count($textarray[0]);
}
function
substr_entities($text,$start,$limit=0)
{
   
$return = '';
   
preg_match_all(
       
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.       
       
'(?:&(?!\w;)))s',$text,$textarray);
   
$textarray = $textarray[0];
   
$numchars = count($textarray)-1;
    if (
$start>=$numchars)
        return
false;
    if (
$start<0)
    {
       
$start = ($numchars)+$start+1;
    }
    if (
$start>=0)
    {
        if (
$limit==0)
        {
           
$end=$numchars;
        }
        elseif (
$limit>0)
        {
           
$end = $start+($limit-1);
        }
        else
        {
           
$end = ($numchars)+$limit;
        }

        for (
$i=$start;($i<=$end && isset($textarray[$i]));$i++)
        {
           
$return .= $textarray[$i];
        }
        return
$return;
    }
}
?>
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0
Anonymous
6 years ago
Split a string to an array of strings specified by an array of lengths:

<?php
function split_by_lengths($inString, $arrayLengths)
{
   
$output = array();
    foreach (
$arrayLengths as $oneLength)
    {
       
$output[] = substr($inString, 0, $oneLength);
       
$inString = substr($inString, $oneLength);
    }
    return (
$output);
}
?>
split_by_lengths('teststringtestteststring', array(4,6,4,4,6)) returns:
array('test','string','test','test','string')

Don't use it on user input without some error handling!
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0
kriskra at gmail dot com
6 years ago
The javascript charAt equivalent in php of felipe has a little bug. It's necessary to compare the type (implicit) aswell or the function returns a wrong result:
<?php
function charAt($str,$pos) {
    return (
substr($str,$pos,1) !== false) ? substr($str,$pos,1) : -1;
}
?>
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0
Anonymous
6 years ago
I've used the between, after, before, etc functions that biohazard put together for years and they work great.  I've also added to it a new function that I use a lot and thought others might like it as well.  It uses his before/after functions so they are required to use it.

<?php
$example_html
= "<p>test1 Test2</p><title>hi there</title><p>Testing</p>";
$paragraph_text = multi_between('<p>', '</p>', $example_html);

//Prints an arry of:
//Array ( [1] => test1 Test2 [2] => Testing )
print_r($paragraph_text);

function
multi_between($this, $that, $inthat)
{
  
$counter = 0;
   while (
$inthat)
   {
     
$counter++;
     
$elements[$counter] = before($that, $inthat);
     
$elements[$counter] = after($this, $elements[$counter]);
     
$inthat = after($that, $inthat);
   }
   return
$elements;
}
//Get the help functions from biohazard's post below.
?>
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0
ijavier aka(not imatech) igjav
7 years ago
<?php
/*
    An advanced substr but without breaking words in the middle.
    Comes in 3 flavours, one gets up to length chars as a maximum, the other with length chars as a minimum up to the next word, and the other considers removing final dots, commas and etcteteras for the sake of beauty (hahaha).
   This functions were posted by me some years ago, in the middle of the ages I had to use them in some corporations incorporated, with the luck to find them in some php not up to date mirrors. These mirrors are rarely being more not up to date till the end of the world... Well, may be am I the only person that finds usef not t bre word in th middl?

Than! (ks)

This is the calling syntax:

    snippet(phrase,[max length],[phrase tail])
    snippetgreedy(phrase,[max length before next space],[phrase tail])

*/

function snippet($text,$length=64,$tail="...") {
   
$text = trim($text);
   
$txtl = strlen($text);
    if(
$txtl > $length) {
        for(
$i=1;$text[$length-$i]!=" ";$i++) {
            if(
$i == $length) {
                return
substr($text,0,$length) . $tail;
            }
        }
       
$text = substr($text,0,$length-$i+1) . $tail;
    }
    return
$text;
}

// It behaves greedy, gets length characters ore goes for more

function snippetgreedy($text,$length=64,$tail="...") {
   
$text = trim($text);
    if(
strlen($text) > $length) {
        for(
$i=0;$text[$length+$i]!=" ";$i++) {
            if(!
$text[$length+$i]) {
                return
$text;
            }
        }
       
$text = substr($text,0,$length+$i) . $tail;
    }
    return
$text;
}

// The same as the snippet but removing latest low punctuation chars,
// if they exist (dots and commas). It performs a later suffixal trim of spaces

function snippetwop($text,$length=64,$tail="...") {
   
$text = trim($text);
   
$txtl = strlen($text);
    if(
$txtl > $length) {
        for(
$i=1;$text[$length-$i]!=" ";$i++) {
            if(
$i == $length) {
                return
substr($text,0,$length) . $tail;
            }
        }
        for(;
$text[$length-$i]=="," || $text[$length-$i]=="." || $text[$length-$i]==" ";$i++) {;}
       
$text = substr($text,0,$length-$i+1) . $tail;
    }
    return
$text;
}

/*
echo(snippet("this is not too long to run on the column on the left, perhaps, or perhaps yes, no idea") . "<br>");
echo(snippetwop("this is not too long to run on the column on the left, perhaps, or perhaps yes, no idea") . "<br>");
echo(snippetgreedy("this is not too long to run on the column on the left, perhaps, or perhaps yes, no idea"));
*/
?>
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persisteus at web dot de
7 years ago
Here is also a nice (but a bit slow) alternative for colorizing an true color image:

<?php
// $colorize = hexadecimal code in String format, f.e. "10ffa2"
// $im = the image that have to be computed

$red = hexdec(substr($colorize, 0, 2));
$green = hexdec(substr($colorize, 2, 2));
$blue = hexdec(substr($colorize, 4, 2));

$lum_c = floor(($red*299 + $green*587 + $blue*144) / 1000);

for (
$i = 0; $i < $lum_c; $i++)
{
 
$r = $red * $i / $lum_c;
 
$g = $green * $i / $lum_c;
 
$b = $blue * $i / $lum_c;
 
$pal[$i] = $r<<16 | $g<<8 | $b;
}
$pal[$lum_c] = $red<<16 | $green<<8 | $blue;
for (
$i = $lum_c+1; $i < 255; $i++)
{
 
$r = $red + (255-$red) * ($i-$lum_c) / (255-$lum_c);
 
$g = $green + (255-$green) * ($i-$lum_c) / (255-$lum_c);
 
$b = $blue + (255-$blue) * ($i-$lum_c) / (255-$lum_c);
 
$pal[$i] = $r<<16 | $g<<8 | $b;
}

$sy = imagesy($im);
$sx = imagesx($im);
for(
$y=0;$y<$sy;$y++)
{
  for(
$x=0;$x<$sx;$x++)
  {
   
$rgba = imagecolorat($im, $x, $y);
   
$a = ($rgba & 0x7F000000) >> 24;
   
$r = ($rgba & 0xFF0000) >> 16;
   
$g = ($rgba & 0x00FF00) >> 8;
   
$b = ($rgba & 0x0000FF);

   
$lum = floor(($r*299+$g*587+$b*144)/1000);

   
imagesetpixel($im, $x, $y, $a<<24 | $pal[$lum]);
  }
}
?>
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mr at bbp dot biz
8 years ago
Here's a little addon to the html_substr function posted by fox.

Now it counts only chars outside of tags, and doesn't cut words.

Note: this will only work in xhtml strict/transitional due to the checking of "/>" tags and the requirement of quotations in every value of a tag. It's also only been tested with the presence of br, img, and a tags, but it should work with the presence of any tag.

<?php
function html_substr($posttext, $minimum_length = 200, $length_offset = 20, $cut_words = FALSE, $dots = TRUE) {
  
   
// $minimum_length:
    // The approximate length you want the concatenated text to be  


    // $length_offset:
    // The variation in how long the text can be in this example text
    // length will be between 200 and 200-20=180 characters and the
    // character where the last tag ends

    // Reset tag counter & quote checker
   
$tag_counter = 0;
   
$quotes_on = FALSE;
   
// Check if the text is too long
   
if (strlen($posttext) > $minimum_length) {
       
// Reset the tag_counter and pass through (part of) the entire text
       
$c = 0;
        for (
$i = 0; $i < strlen($posttext); $i++) {
           
// Load the current character and the next one
            // if the string has not arrived at the last character
           
$current_char = substr($posttext,$i,1);
            if (
$i < strlen($posttext) - 1) {
               
$next_char = substr($posttext,$i + 1,1);
            }
            else {
               
$next_char = "";
            }
           
// First check if quotes are on
           
if (!$quotes_on) {
               
// Check if it's a tag
                // On a "<" add 3 if it's an opening tag (like <a href...)
                // or add only 1 if it's an ending tag (like </a>)
               
if ($current_char == '<') {
                    if (
$next_char == '/') {
                       
$tag_counter += 1;
                    }
                    else {
                       
$tag_counter += 3;
                    }
                }
               
// Slash signifies an ending (like </a> or ... />)
                // substract 2
               
if ($current_char == '/' && $tag_counter <> 0) $tag_counter -= 2;
               
// On a ">" substract 1
               
if ($current_char == '>') $tag_counter -= 1;
               
// If quotes are encountered, start ignoring the tags
                // (for directory slashes)
               
if ($current_char == '"') $quotes_on = TRUE;
            }
            else {
               
// IF quotes are encountered again, turn it back off
               
if ($current_char == '"') $quotes_on = FALSE;
            }
          
           
// Count only the chars outside html tags
           
if($tag_counter == 2 || $tag_counter == 0){
               
$c++;
            }          
                          
           
// Check if the counter has reached the minimum length yet,
            // then wait for the tag_counter to become 0, and chop the string there
           
if ($c > $minimum_length - $length_offset && $tag_counter == 0 && ($next_char == ' ' || $cut_words == TRUE)) {
               
$posttext = substr($posttext,0,$i + 1);              
                if(
$dots){
                  
$posttext .= '...';
                }
                return
$posttext;
            }
        }
    }  
    return
$posttext;
}

?>
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bleakwind at msn dot com
9 years ago
This returns the portion of str specified by the start and length parameters..
It can performs multi-byte safe on number of characters. like mb_strcut() ...

Note:
1.Use it like this bite_str(string str, int start, int length [,byte of on string]);
2.First character's position is 0. Second character position is 1, and so on...
3.$byte is one character length of your encoding, For example: utf-8 is "3", gb2312 and big5 is "2"...you can use the function strlen() get it...
Enjoy it :) ...

--- Bleakwind
QQ:940641
http://www.weaverdream.com

PS:I'm sorry my english is too poor... :(

<?php
// String intercept By Bleakwind
// utf-8:$byte=3 | gb2312:$byte=2 | big5:$byte=2
function bite_str($string, $start, $len, $byte=3)
{
   
$str     = "";
   
$count   = 0;
   
$str_len = strlen($string);
    for (
$i=0; $i<$str_len; $i++) {
        if ((
$count+1-$start)>$len) {
           
$str  .= "...";
            break;
        } elseif ((
ord(substr($string,$i,1)) <= 128) && ($count < $start)) {
           
$count++;
        } elseif ((
ord(substr($string,$i,1)) > 128) && ($count < $start)) {
           
$count = $count+2;
           
$i     = $i+$byte-1;
        } elseif ((
ord(substr($string,$i,1)) <= 128) && ($count >= $start)) {
           
$str  .= substr($string,$i,1);
           
$count++;
        } elseif ((
ord(substr($string,$i,1)) > 128) && ($count >= $start)) {
           
$str  .= substr($string,$i,$byte);
           
$count = $count+2;
           
$i     = $i+$byte-1;
        }
    }
    return
$str;
}

// Test
$str = "123456ֽ123456ַ123456ȡ";
for(
$i=0;$i<30;$i++){
    echo
"<br>".bite_str($str,$i,20);   
}
?>
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andrewmclagan at gmail dot com
9 years ago
Hi there here is a little function i wrote to limit the number of lines in a string, i could not find anything else like it out there   

<?php
function lineLimiter ($string = "", $max_lines = 1) {
   
        
$string = ereg_replace("\n", "##", $string);
   
        
$totalLines = (substr_count($string, '##') + 1);
   
        
$string = strrev($string);
   
        
$stringLength = strlen($string);
                    
         while (
$totalLines > $max_lines) {
            
$pos = 0;
            
$pos = strpos ( $string, "##") + 2;
            
//$pos = $pos - $stringLength;
            
$string = substr($string, $pos);
            
$totalLines--;   
         }
        
$string = strrev($string);
         
$string = ereg_replace("##", "\n", $string);
         return
$string;
    }
?>
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Robert Chapin
7 years ago
All the references to "curly braces" on this page appear to be obsolete.

According to http://us.php.net/manual/en/language.types.string.php

"Using square array-brackets is preferred because the {braces} style is deprecated as of PHP 6."

Robert Chapin
Chapin Information Services
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Anonymous
11 years ago
If you want to substring the middle of a string with another and keep the words intact:

<?php
/**
* Reduce a string by the middle, keeps whole words together
*
* @param string $string
* @param int $max (default 50)
* @param string $replacement (default [...])
* @return string
* @author david at ethinkn dot com
* @author loic at xhtml dot ne
* @author arne dot hartherz at gmx dot net
*/

function strMiddleReduceWordSensitive ($string, $max = 50, $rep = '[...]') {
   
$strlen = strlen($string);

    if (
$strlen <= $max)
        return
$string;

   
$lengthtokeep = $max - strlen($rep);
   
$start = 0;
   
$end = 0;

    if ((
$lengthtokeep % 2) == 0) {
       
$start = $lengthtokeep / 2;
       
$end = $start;
    } else {
       
$start = intval($lengthtokeep / 2);
       
$end = $start + 1;
    }

   
$i = $start;
   
$tmp_string = $string;
    while (
$i < $strlen) {
        if (
$tmp_string[$i] == ' ') {
           
$tmp_string = substr($tmp_string, 0, $i) . $rep;
           
$return = $tmp_string;
        }
       
$i++;
    }

   
$i = $end;
   
$tmp_string = strrev ($string);
    while (
$i < $strlen) {
        if (
$tmp_string[$i] == ' ') {
           
$tmp_string = substr($tmp_string, 0, $i);
           
$return .= strrev ($tmp_string);
        }
       
$i++;
    }
    return
$return;
    return
substr($string, 0, $start) . $rep . substr($string, - $end);
}

echo
strMiddleReduceWordSensitive ('ABCDEEF GHIJK LLKJHKHKJHKL HGHFK sdfasdfsdafsdf sadf asdf sadf sad s', 30) . "\n";
// Returns: ABCDEEF GHIJK[...]asdf sadf sad s (33 chrs)
echo strMiddleReduceWordSensitive ('ABCDEEF GHIJK LLKJHKHKJHKL HGHFK sdfasdfsdafsdf sadf asdf sadf sad s', 30, '...') . "\n";
// Returns: ABCDEEF GHIJK...asdf sadf sad s (32 chrs)
?>
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highstrike at gmail dot com
6 years ago
Because i didnt see a function that would cut a phrase from a text (article or whatever) no matter where, front/middle/end and add ... + keeping the words intact, i wrote this:

Usage:
- The parameter $value if array will need the whole text and the portion you want to start from, a string. EG: cuttext(array($text, $string), 20). If the string is "have" and is near the beginning of the text, the function will cut like "I have a car ...", if the string is in the middle somewhere it will cut like "... if you want to have your own car ..." and if its somewhere near the end it will cut like "... and you will have one."
- The $length parameter is self explanatory.

Note: if you have just a string "127hh43h2h52312453jfks2" and you want to cut it, just use the function like so: cuttext($string, 10) and it will cut it like "127hh43h2h..."

<?php

////////////////////////////////////////////////////////
// Function:         cuttext
// Description: Cuts a string and adds ...

function cuttext($value, $length)
{   
    if(
is_array($value)) list($string, $match_to) = $value;
    else {
$string = $value; $match_to = $value{0}; }

   
$match_start = stristr($string, $match_to);
   
$match_compute = strlen($string) - strlen($match_start);

    if (
strlen($string) > $length)
    {
        if (
$match_compute < ($length - strlen($match_to)))
        {
           
$pre_string = substr($string, 0, $length);
           
$pos_end = strrpos($pre_string, " ");
            if(
$pos_end === false) $string = $pre_string."...";
            else
$string = substr($pre_string, 0, $pos_end)."...";
        }
        else if (
$match_compute > (strlen($string) - ($length - strlen($match_to))))
        {
           
$pre_string = substr($string, (strlen($string) - ($length - strlen($match_to))));
           
$pos_start = strpos($pre_string, " ");
           
$string = "...".substr($pre_string, $pos_start);
            if(
$pos_start === false) $string = "...".$pre_string;
            else
$string = "...".substr($pre_string, $pos_start);
        }
        else
        {       
           
$pre_string = substr($string, ($match_compute - round(($length / 3))), $length);
           
$pos_start = strpos($pre_string, " "); $pos_end = strrpos($pre_string, " ");
           
$string = "...".substr($pre_string, $pos_start, $pos_end)."...";
            if(
$pos_start === false && $pos_end === false) $string = "...".$pre_string."...";
            else
$string = "...".substr($pre_string, $pos_start, $pos_end)."...";
        }

       
$match_start = stristr($string, $match_to);
       
$match_compute = strlen($string) - strlen($match_start);
    }
   
    return
$string;
}

?>
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greg at apparel dot com
1 year ago
Coming to PHP from classic ASP I am used to the Left() and Right() functions built into ASP so I did a quick PHPversion. hope these help someone else making the switch

function left($str, $length) {
    return substr($str, 0, $length);
}

function right($str, $length) {
    return substr($str, -$length);
}
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fengdingbo at gmail dot com
1 year ago
<?php    
$a
= 'abc';   
$php = 'ok123';   
$str = microtime(TRUE);   
for(
$i=0;$i<=1000000;$i++)    
   
$a = substr($php,1,1);   
echo
microtime(true)-$str,"\n";                                                                                                                 
$str = microtime(TRUE);   
for(
$i=0;$i<=1000000;$i++)    
   
$a = $php[1];   
echo
microtime(true)-$str;
?>
output:
0.26694822311401
0.10447096824646
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-1
NULL_byte
6 years ago
<?php

function insert_substr($str, $pos, $substr) {
   
$part1 = substr($str, 0, -$pos);
   
$part2 = substr($str, -$pos);
    return
$part1.$substr.$part2;
}

?>
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php_net at thomas dot trella dot de
9 years ago
I needed to cut a string after x chars at a  html converted utf-8 text (for example Japanese text like &#23344;&#35632;&#24368;&#33072;&#27440;&#32591;).
The problem was, the different length of the signs, so I wrote the following function to handle that.
Perhaps it helps.

<?php

function html_cutstr ($str, $len)
{
    if (!
preg_match('/\&#[0-9]*;.*/i', $str))
    {
       
$rVal = strlen($str, $len);
        break;
    }

   
$chars = 0;
   
$start = 0;
    for(
$i=0; $i < strlen($str); $i++)
    {
        if (
$chars >= $len)
        break;

       
$str_tmp = substr($str, $start, $i-$start);
        if (
preg_match('/\&#[0-9]*;.*/i', $str_tmp))
        {
           
$chars++;
           
$start = $i;
        }
    }
   
$rVal = substr($str, 0, $start);
    if (
strlen($str) > $start)
   
$rVal .= " ...";
    return
$rVal;
}
?>
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Quicker
3 years ago
If you need to parse utf-8 strings char by char, try this one:

<?php
     $utf8marker
=chr(128);
    
$count=0;
     while(isset(
$string{$count})){
       if(
$string{$count}>=$utf8marker) {
        
$parsechar=substr($string,$count,2);
        
$count+=2;
       } else {
        
$parsechar=$string{$count};
        
$count++;
       }
      
/* do what you like with parsechar ... , eg.:*/  echo $parsechar."<BR>\r\n";
     }
?>

- it works without mb_substr
- it is fast, because it grabs characters based on indexes  when possible and avoids any count and split functions
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Anonymous
6 years ago
I wrote this simple function to limit the middle characters of a string to a specified length.

<?php
$input
= "hello world"
echo(limitchrmid($imput,10)) // hel ... rld

//limit chars middle
function limitchrmid($value,$lenght){
    if (
strlen($value) >= $lenght ){
       
$lenght_max = ($lenght/2)-3;
       
$start = strlen($value)- $lenght_max;
       
$limited = substr($value,0,$lenght_max);
       
$limited.= " ... ";                  
       
$limited.= substr($value,$start,$lenght_max);
    }
    else{
       
$limited = $value;
    }
    return
$limited;
}
?>
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maxim at inbox dot ru
2 years ago
Here is a recursion function to get parts of passed string which are in a char. Func looks pretty, and works fast, tell me please if you find more opt way.
<?php
$s
= "info= &make&,endvcc &new& &another&info";
echo
str_cut($s,"&",",");
//output:
//make,new,another

function str_cut($s,$a,$d="")
{
   
$f=strpos($s,$a)+1;
   
$l=strpos($s,$a,$f);
   
$out= substr($s,$f,$l-$f);
                if
    (
strpos($s,$a,$l+1)!==false)
    {
$s=substr($s,$l+1);$out.=$d.str_cut($s,$a,$d);}
return
$out;
}
?>

it is possible to output in array, you have to returns a var as an array.
Also you can add an extra needle, which would be compare with the end of strings :
replace to
$l=strpos($s,$b,$f)-$f;
and dont forget to pass into recursion call $b value, but i did like that
$b=func_get_arg(func_num_args()-1);
care! the last argument should be $a, because $b getting last arg. like that:
function str_cut($s,$d="",$a)
but i think this method of getting $b not the best way for perfomance.
Sorry for my English.
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-4
mr.davin
6 years ago
Simple use of substr to determine possession:

<?php
function possessive ($word) {
    return 
$word.(substr($word, -1) == 's' ? "'" : "'s");
}

// Davis => Davis'
// Paul => Paul's
?>
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nanhe dot kumar at gmail dot com
1 year ago
<?php
$string
="NanheKumar";
echo
substr($string,0,5); //Nanhe
echo substr($string,5); //Kumar
echo substr($string,-4); //umar
echo substr($string,-4,2); //um
echo substr($string,2,6); //umnheKum
?>
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jeff dot swain at pcmmllc dot com
4 years ago
I noticed a slight issue when parsing out long strings using the substr function.

Here is my string: $merge = "UPDATE AssistanceRequest SET RequestorID = '4301' WHERE RequestorID IN ( '4535','6222','4865','5137','4893')"

To parse out the WHERE portion I used:
$whereClause = substr($merge, strpos($merge,'WHERE', (strlen($merge) - strpos($merge,'WHERE'))));
Normally the function returned: $whereClause = "WHERE RequestorID IN ( '4535','6222','4865','5137','4893')"

This $whereClause gives me the WHERE clause to modify the MSSQL database records being manipulated. So that when I used $whereClause as the WHERE clause to create subsequent SQL, I used the following syntax: $setDeleteFlag = "UPDATE AssistanceRequestor SET bIsDirty = 'DELETE' " . $whereClause;

This should have returned: $setDeleteFlag = "UPDATE AssistanceRequestor SET bIsDirty = 'DELETE' WHERE RequestorID IN ( '4535','6222','4865','5137','4893')"

As long as the length of the original $merge string was less than 104 characters, the $setDeleteFlag sql came out correctly. However, when the length of the original $merge string exceeded 104 characters, I got this returned:

$setDeleteFlag = "UPDATE AssistanceRequestor SET bIsDirty = 'DELETE' UPDATE AssistanceRequestor SET bIsDirty = 'DELETE' WHERE RequestorID IN ( '4535','6222','4865','5137','4893')"

The result was that the bIsDirty field for every record in the database was set to 'DELETE'. I fixed it by breaking apart the substr to create the original $whereClause so that it looked like this:

$wherePosition = strpos($merge,'WHERE');
$whereClause = substr($merge, $wherePosition, strlen($merge) - $wherePosition);
$setDeleteFlag = "UPDATE AssistanceRequestor SET bIsDirty = 'DELETE' " . $whereClause;

I do have to note that I run PHP 5.x on my development server, while I think the production host is still on 4.x. I did not seem to have an issue in development, but I don't think I tested strings longer than 104 characters. Maybe this issue has been corrected in version 5.x.
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eallik at hotmail dot com
8 years ago
Be careful when comparing the return value of substr to FALSE. FALSE may be returned even if the output is a valid string.

substr("0", 0); // equals "0", comparision with FALSE evaluates to true, because "0" == 0 == FALSE
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-6
Jarrod Nettles (jarrod at squarecrow dot com)
4 years ago
I've seen numerous requests over the years from people trying to put together templating systems using XML parsers or regular expressions - you can create a simple template system with the following class. It could easily be expanded to take advantage of parameters, conditionals, etc.

<?php

class Template
{
    const
OPEN_BRACKET = "{";
    const
CLOSE_BRACKET = "}";

    public static function
inject(array $source, $template)
    {
       
$ob_size = strlen(self::OPEN_BRACKET);
       
$cb_size = strlen(self::CLOSE_BRACKET);
       
       
$pos = 0;
       
$end = strlen($template);
       
        while(
$pos <= $end)
        {
            if(
$pos_1 = strpos($template, self::OPEN_BRACKET, $pos))
            {
                if(
$pos_1)
                {
                   
$pos_2 = strpos($template, self::CLOSE_BRACKET, $pos_1);
                   
                    if(
$pos_2)
                    {
                       
$return_length = ($pos_2-$cb_size) - $pos_1;
                       
                       
$var = substr($template, $pos_1+$ob_size, $return_length);
                       
                       
$template = str_replace(self::OPEN_BRACKET.$var.self::CLOSE_BRACKET, $source[$var], $template);
                       
                       
$pos = $pos_2 + $cb_size;
                    }
                    else
                    {
                        throw new
exception("Incorrectly formed template - missing closing bracket. Please check your syntax.");
                        break;
                    }
                }
            }
            else
            {
               
//exit the loop
               
break;
            }
        }
       
        return
$template;
    }
   
}

//array of values to inject into the template
$array = array("NAME" => "John Doe",
               
"DOB"    => "12/21/1986",
               
"ACL" => "Super Administrator");

//template using '{' and '}' to signify variables
$template = "This is your template, {NAME}. You were born on {DOB} and you are a {ACL} on this system.";

echo
Template::inject($array, $template);
?>
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benny at bennyborn dot de
5 years ago
If you need a word-sensitive and also html-tags aware version of substr, this one should do the job. It works fine for me

<?php
/**
* word-sensitive substring function with html tags awareness
* @param text The text to cut
* @param len The maximum length of the cut string
* @returns string
**/
function substrws( $text, $len=180 ) {

    if( (
strlen($text) > $len) ) {

       
$whitespaceposition = strpos($text," ",$len)-1;

        if(
$whitespaceposition > 0 )
           
$text = substr($text, 0, ($whitespaceposition+1));

       
// close unclosed html tags
       
if( preg_match_all("|<([a-zA-Z]+)>|",$text,$aBuffer) ) {

            if( !empty(
$aBuffer[1]) ) {

               
preg_match_all("|</([a-zA-Z]+)>|",$text,$aBuffer2);

                if(
count($aBuffer[1]) != count($aBuffer2[1]) ) {

                    foreach(
$aBuffer[1] as $index => $tag ) {

                        if( empty(
$aBuffer2[1][$index]) || $aBuffer2[1][$index] != $tag)
                           
$text .= '</'.$tag.'>';
                    }
                }
            }
        }
    }

    return
$text;
}
?>
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