SunshinePHP Developer Conference 2015

chr

(PHP 4, PHP 5)

chrRetourne un caractère à partir de son code ASCII

Description

string chr ( int $ascii )

Retourne une chaîne d'un seul caractère, dont le code ASCII est donné par le paramètre ascii.

Cette fonction complète la fonction ord().

Liste de paramètres

ascii

Le code ascii.

Valeurs de retour

Retourne le caractère à partir de son code ASCII.

Exemples

Exemple #1 Exemple avec chr()

<?php
$str 
"The string ends in escape: ";

// Ajoute un caractère d'échappement à la fin de la chaîne $str
$str .= chr(27);

// Ceci est souvent plus pratique, et réalise la même chose

$str sprintf("The string ends in escape: %c"27);
?>

Voir aussi

add a note add a note

User Contributed Notes 26 notes

up
9
voromax
5 years ago
Another quick and short function to get unicode char by its code.

<?php
/**
* Return unicode char by its code
*
* @param int $u
* @return char
*/
function unichr($u) {
    return
mb_convert_encoding('&#' . intval($u) . ';', 'UTF-8', 'HTML-ENTITIES');
}
?>
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5
darek at module17 dot com
1 year ago
Simple password generation function using sprintf and the %c type specifier; which is the same as chr().

function genPass($len = 8) {
    for ($i=0;$i<=$len;$i++) {
        $passwd = sprintf('%s%c', isset($passwd) ? $passwd : NULL, rand(48, 122));
    }
    return $passwd;
}
up
9
perrodin at laposte dot net
10 years ago
Note that if the number is higher than 256, it will return the number mod 256.
For example :
chr(321)=A because A=65(256)
up
6
joeldegan AT yahoo.com
11 years ago
Want terminal colors in command line php scripts?

This should take care of that.
<?

$_colors = array(
        'LIGHT_RED'      => "[1;31m",
        'LIGHT_GREEN'     => "[1;32m",
        'YELLOW'     => "[1;33m",
        'LIGHT_BLUE'     => "[1;34m",
        'MAGENTA'     => "[1;35m",
        'LIGHT_CYAN'     => "[1;36m",
        'WHITE'     => "[1;37m",
        'NORMAL'     => "[0m",
        'BLACK'     => "[0;30m",
        'RED'         => "[0;31m",
        'GREEN'     => "[0;32m",
        'BROWN'     => "[0;33m",
        'BLUE'         => "[0;34m",
        'CYAN'         => "[0;36m",
        'BOLD'         => "[1m",
        'UNDERSCORE'     => "[4m",
        'REVERSE'     => "[7m",

);

function termcolored($text, $color="NORMAL", $back=1){
    global $_colors;
    $out = $_colors["$color"];
    if($out == ""){ $out = "[0m"; }
    if($back){
        return chr(27)."$out$text".chr(27).chr(27)."[0m".chr(27);
    }else{
        echo chr(27)."$out$text".chr(27).chr(27)."[0m".chr(27);
    }//fi
}// end function

echo termcolored("test\n", "BLUE");
?>
up
4
ddawsonNOSPAM at execpc dot com
14 years ago
[Editor's note:

%c is defined as: "Print the character belonging to the ascii code given"

chr() just gives a string, so you need to use %s, even if the string consists of only one character. This is consistent with other languages.
--Jeroen@php.net]


Learn from my mistake:
Do not expect this to work!

<?php
$c_question
= chr(63);
$v_out = sprintf("<%cphp\n", $c_question);
//... more stuff being sprintf'd into v_out here ...
$v_out = sprintf("%s%c>\n", $v_out, $c_question);
$v_fp = fopen("foofile", "w");
if (
$v_fp)
{
    
fwrite($v_fp, $v_out, strlen($v_out));
    
fclose($v_fp);
}
?>

When I did this, foofile contained <NUL NUL NUL NUL NUL>.
I spun my wheels quite awhile looking at fputs, fwrite to verify I was calling those functions correctly.
My mistake was using $c_question = chr(63) instead of
$c_question = 63 (correct).  Then everything worked fine.
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3
sarabas at itstudio dot pl
9 years ago
The following function helped me to generate ascii-only usernames from firstname/lastname containing iso-8859-2 characters. The convertion array was based on contents of 'man iso-8859-2'.

Example: iso2ascii("b&#322;a&#380;ej.&#378;d&#378;b&#322;o") returns "blazej.zdzblo"

<?php
function iso2ascii($str) {
$arr=array(
 
chr(161)=>'A', chr(163)=>'L', chr(165)=>'L', chr(166)=>'S', chr(169)=>'S',
 
chr(170)=>'S', chr(171)=>'T', chr(172)=>'Z', chr(174)=>'Z', chr(175)=>'Z',
 
chr(177)=>'a', chr(179)=>'l', chr(181)=>'l', chr(182)=>'s', chr(185)=>'s',
 
chr(186)=>'s', chr(187)=>'t', chr(188)=>'z', chr(190)=>'z', chr(191)=>'z',
 
chr(192)=>'R', chr(193)=>'A', chr(194)=>'A', chr(195)=>'A', chr(196)=>'A',
 
chr(197)=>'L', chr(198)=>'C', chr(199)=>'C', chr(200)=>'C', chr(201)=>'E',
 
chr(202)=>'E', chr(203)=>'E', chr(204)=>'E', chr(205)=>'I', chr(206)=>'I',
 
chr(207)=>'D', chr(208)=>'D', chr(209)=>'N', chr(210)=>'N', chr(211)=>'O',
 
chr(212)=>'O', chr(213)=>'O', chr(214)=>'O', chr(216)=>'R', chr(217)=>'U',
 
chr(218)=>'U', chr(219)=>'U', chr(220)=>'U', chr(221)=>'Y', chr(222)=>'T',
 
chr(223)=>'s', chr(224)=>'r', chr(225)=>'a', chr(226)=>'a', chr(227)=>'a',
 
chr(228)=>'a', chr(229)=>'l', chr(230)=>'c', chr(231)=>'c', chr(232)=>'c',
 
chr(233)=>'e', chr(234)=>'e', chr(235)=>'e', chr(236)=>'e', chr(237)=>'i',
 
chr(238)=>'i', chr(239)=>'d', chr(240)=>'d', chr(241)=>'n', chr(242)=>'n',
 
chr(243)=>'o', chr(244)=>'o', chr(245)=>'o', chr(246)=>'o', chr(248)=>'r',
 
chr(249)=>'u', chr(250)=>'u', chr(251)=>'u', chr(252)=>'u', chr(253)=>'y',
 
chr(254)=>'t'
);
return
strtr($str,$arr);
}
?>
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3
Emprivo.com
5 years ago
Replaces special characters with non-special equivalents

<?php
function normalize_special_characters( $str )
{
   
# Quotes cleanup
   
$str = ereg_replace( chr(ord("`")), "'", $str );        # `
   
$str = ereg_replace( chr(ord("´")), "'", $str );        # ´
   
$str = ereg_replace( chr(ord("„")), ",", $str );        # „
   
$str = ereg_replace( chr(ord("`")), "'", $str );        # `
   
$str = ereg_replace( chr(ord("´")), "'", $str );        # ´
   
$str = ereg_replace( chr(ord("“")), "\"", $str );        # “
   
$str = ereg_replace( chr(ord("”")), "\"", $str );        # ”
   
$str = ereg_replace( chr(ord("´")), "'", $str );        # ´

   
$unwanted_array = array(    'Š'=>'S', 'š'=>'s', 'Ž'=>'Z', 'ž'=>'z', 'À'=>'A', 'Á'=>'A', 'Â'=>'A', 'Ã'=>'A', 'Ä'=>'A', 'Å'=>'A', 'Æ'=>'A', 'Ç'=>'C', 'È'=>'E', 'É'=>'E',
                               
'Ê'=>'E', 'Ë'=>'E', 'Ì'=>'I', 'Í'=>'I', 'Î'=>'I', 'Ï'=>'I', 'Ñ'=>'N', 'Ò'=>'O', 'Ó'=>'O', 'Ô'=>'O', 'Õ'=>'O', 'Ö'=>'O', 'Ø'=>'O', 'Ù'=>'U',
                               
'Ú'=>'U', 'Û'=>'U', 'Ü'=>'U', 'Ý'=>'Y', 'Þ'=>'B', 'ß'=>'Ss', 'à'=>'a', 'á'=>'a', 'â'=>'a', 'ã'=>'a', 'ä'=>'a', 'å'=>'a', 'æ'=>'a', 'ç'=>'c',
                               
'è'=>'e', 'é'=>'e', 'ê'=>'e', 'ë'=>'e', 'ì'=>'i', 'í'=>'i', 'î'=>'i', 'ï'=>'i', 'ð'=>'o', 'ñ'=>'n', 'ò'=>'o', 'ó'=>'o', 'ô'=>'o', 'õ'=>'o',
                               
'ö'=>'o', 'ø'=>'o', 'ù'=>'u', 'ú'=>'u', 'û'=>'u', 'ý'=>'y', 'ý'=>'y', 'þ'=>'b', 'ÿ'=>'y' );
   
$str = strtr( $str, $unwanted_array );

   
# Bullets, dashes, and trademarks
   
$str = ereg_replace( chr(149), "&#8226;", $str );    # bullet •
   
$str = ereg_replace( chr(150), "&ndash;", $str );    # en dash
   
$str = ereg_replace( chr(151), "&mdash;", $str );    # em dash
   
$str = ereg_replace( chr(153), "&#8482;", $str );    # trademark
   
$str = ereg_replace( chr(169), "&copy;", $str );    # copyright mark
   
$str = ereg_replace( chr(174), "&reg;", $str );        # registration mark

   
return $str;
}
?>
up
2
tenyou at gmail dot com
10 years ago
When having to deal with parsing an IIS4 or IIS5 metabase dump I wrote a simple function for converting those MS hexidecimal values into their ascii counter parts. Hopefully someone will find use for it.

<?php
function hex_decode($string)  {
        for (
$i=0; $i < strlen($string); $i)  {
       
$decoded .= chr(hexdec(substr($string,$i,2)));
       
$i = (float)($i)+2;
        }
return
$decoded;
}
?>
up
1
sinfocol at sinfocol dot org
5 years ago
The function chr() also accepts negative numbers as an ascii code, so chr(-number) is equal to chr((number%256)+256).
And for ascii code higher than 255 is chr(number%256)

We can test with a little script
<?php
   
for($i=-300; $i<300; $i++){
        echo
"Ascii $i\t" . ord(chr($i)) . "\n";
    }
?>
up
1
happyevil(at)1218.org
13 years ago
Here is a function that's help me find what chr(number) outputs what character quicker than typing out 256 echo tags.

<?php
function listChr(){
  for (
$i = 0; $i < 256; ++$i) {
  static
$genNum;
 
$genNum++;
  echo
"chr($genNum) will output '";
  echo (
chr($genNum));
  echo
"'< br>\n";
  }
}
listChr();
?>

Another helpful chr is #9, being a tab.  Quite using when making error logs.

$tab = (chr(9));
echo "<pre>error{$tab}date{$tab}time</pre>";

-- HappyEvil
up
1
gjarrige at six-axe dot fr
2 years ago
to remove the ASCII control characters (except "line feed" and "tab") :

$tab_chr = array() ;
for($control = 0; $control < 32; $control++) {
    if ($control != 9 && $control != 10) {
        $tab_chr[]= chr($control) ;
    }
}
$tab_chr[]= chr(127) ;   
$string = str_replace($tab_chr, '', $string);
up
1
darkodemon at gmail dot com
7 years ago
chr() with unicode support

<?php

function uchr ($codes) {
    if (
is_scalar($codes)) $codes= func_get_args();
   
$str= '';
    foreach (
$codes as $code) $str.= html_entity_decode('&#'.$code.';',ENT_NOQUOTES,'UTF-8');
    return
$str;
}

echo
uchr(23383); echo '<br/>';
echo
uchr(23383,215,23383); echo '<br/>';
echo
uchr(array(23383,215,23383,215,23383)); echo '<br/>';

?>
up
1
Kristin
11 years ago
Note that chr(10) is a 'line feed' and chr(13) is a 'carriage return' and they are not the same thing! I found this out while attempting to parse text from forms and text files for inclusion as HTML by replacing all the carriage returns with <BR>'s only to find after many head-scratchings that I should have been looking for line feeds. If anyone can shed some light on what the difference is, please do.

If you're planning on saving text from a form into a database for later display, you'll need to apply the following function so that it gets saved with the proper HTML tags.

<?php
$text
= str_replace ( chr(10), "<BR>", $text );
?>

When you want to plug it back into that form for editing you need to convert it back.

<?php
$text
= str_replace ( "<BR>", chr(10), $text)
?>

Hope this saves somebody some trouble. :)
up
1
JasonLauDotBiz
8 years ago
I didn't see it here, so here's simple random string generation using char.

<?php
for($i=0; $i<7; $i++){
   
$random_string .= chr(rand(0,25)+65);
}
echo
$random_string;
?>
up
0
Pascal
1 month ago
function ascii2str($str) {
    $arr=array(
        "&#32;"=>' ', "&#33;"=>'!', "&#34;"=>'"', "&#35;"=>'#', "&#36;"=>'$',
        "&#37;"=>'%', "&#38;"=>'&', "&#39;"=>"'", "&#40;"=>'(', "&#41;"=>')',
        "&#42;"=>'*', "&#43;"=>'+', "&#44;"=>',', "&#45;"=>'-', "&#46;"=>'.',
        "&#47;"=>'/', "&#48;"=>'0', "&#49;"=>'1', "&#50;"=>'2', "&#51;"=>'3',
        "&#52;"=>'4', "&#53;"=>'5', "&#54;"=>'6', "&#55;"=>'7', "&#56;"=>'8',
        "&#57;"=>'9', "&#58;"=>':', "&#59;"=>';', "&#60;"=>'<', "&#61;"=>'=',
        "&#62;"=>'>', "&#63;"=>'?', "&#64;"=>'@', "&#65;"=>'A', "&#66;"=>'B',
        "&#67;"=>'C', "&#68;"=>'D', "&#69;"=>'E', "&#70;"=>'F', "&#71;"=>'G',
        "&#72;"=>'H', "&#73;"=>'I', "&#74;"=>'J', "&#75;"=>'K', "&#76;"=>'L',
        "&#77;"=>'M', "&#78;"=>'N', "&#79;"=>'O', "&#80;"=>'P', "&#81;"=>'Q',
        "&#82;"=>'R', "&#83;"=>'S', "&#84;"=>'T', "&#85;"=>'U', "&#86;"=>'V',
        "&#87;"=>'W', "&#88;"=>'X', "&#89;"=>'Y', "&#90;"=>'Z', "&#91;"=>'[',
        "&#92;"=>'\\', "&#93;"=>']', "&#94;"=>'^', "&#95;"=>'_', "&#96;"=>'`',
        "&#97;"=>'a', "&#98;"=>'b', "&#99;"=>'c', "&#100;"=>'d', "&#101;"=>'e',
        "&#102;"=>'f', "&#103;"=>'g', "&#104;"=>'h', "&#105;"=>'i', "&#106;"=>'j',
        "&#107;"=>'k', "&#108;"=>'l', "&#109;"=>'m', "&#110;"=>'n', "&#111;"=>'o',
        "&#112;"=>'p', "&#113;"=>'q', "&#114;"=>'r', "&#115;"=>'s', "&#116;"=>'t',
        "&#117;"=>'u', "&#118;"=>'v', "&#119;"=>'w', "&#120;"=>'x', "&#121;"=>'y',
        "&#122;"=>'z', "&#123;"=>'{', "&#124;"=>'|', "&#125;"=>'}', "&#126;"=>'~'
    );
    return strtr($str,$arr);
}
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0
v14t at gmx dot com
6 months ago
argument is automatically converted to integer, so chr('65') and chr(65) would both output the letter A
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0
krkbpk at gmail dot com RamaKrishna Kothamasu
1 year ago
//simple example for chr() function
<?php
$i
=0;
for(
$i;$i<=255;$i++)
{
    echo
chr($i)."<br>";
}
?>
up
0
mailderemi at gmail dot com
3 years ago
Here is a sample of encoding and decoding using "chr" and "ord".
<?php
   
function Encode($txtData,$Level){
        for (
$j = 0;$j<$Level;$j++){
           
$tmpStr = '';
            for (
$i = 0;$i<strlen($txtData);$i++)
               
$tmpStr .= ord(substr(strtoupper($txtData), $i, 1));
           
$txtData = $tmpStr;
        }
        return (
strlen($Level)).$Level.$txtData;
    }

    function
Decode($txtData){
       
$intLevel = substr($txtData, 1, substr($txtData, 0, 1));
       
$startStr = substr($txtData, substr($txtData, 0, 1)+1, strlen($txtData));
        for (
$j = 0;$j<$intLevel;$j++){
            for (
$i = 0;$i<strlen($startStr);$i+=2)
               
$tmpStr .= chr(intval(substr($startStr, $i, 2)));
           
$startStr = $tmpStr;
       
           
$tmpStr = "";
        }
        return
$startStr;
    }

echo
Encode('123',4).'<br>';
echo
Decode(Encode('123',5));
?>
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0
Josh B.
6 years ago
In addition to replacing Microsoft Windows smart quotes, as sgaston demonstrated on 2006-02-13, I replace all other Microsoft Windows characters using suggestions[1] published by character code specialist[2] Jukka Korpela.

<?php
$str
= str_replace(chr(130), ',', $str);    // baseline single quote
$str = str_replace(chr(131), 'NLG', $str);  // florin
$str = str_replace(chr(132), '"', $str);    // baseline double quote
$str = str_replace(chr(133), '...', $str);  // ellipsis
$str = str_replace(chr(134), '**', $str);   // dagger (a second footnote)
$str = str_replace(chr(135), '***', $str);  // double dagger (a third footnote)
$str = str_replace(chr(136), '^', $str);    // circumflex accent
$str = str_replace(chr(137), 'o/oo', $str); // permile
$str = str_replace(chr(138), 'Sh', $str);   // S Hacek
$str = str_replace(chr(139), '<', $str);    // left single guillemet
$str = str_replace(chr(140), 'OE', $str);   // OE ligature
$str = str_replace(chr(145), "'", $str);    // left single quote
$str = str_replace(chr(146), "'", $str);    // right single quote
$str = str_replace(chr(147), '"', $str);    // left double quote
$str = str_replace(chr(148), '"', $str);    // right double quote
$str = str_replace(chr(149), '-', $str);    // bullet
$str = str_replace(chr(150), '-', $str);    // endash
$str = str_replace(chr(151), '--', $str);   // emdash
$str = str_replace(chr(152), '~', $str);    // tilde accent
$str = str_replace(chr(153), '(TM)', $str); // trademark ligature
$str = str_replace(chr(154), 'sh', $str);   // s Hacek
$str = str_replace(chr(155), '>', $str);    // right single guillemet
$str = str_replace(chr(156), 'oe', $str);   // oe ligature
$str = str_replace(chr(159), 'Y', $str);    // Y Dieresis
?>

[1] On the use of some MS Windows characters in HTML
http://www.cs.tut.fi/~jkorpela/www/windows-chars.html

[2] Unicode Explained by Jukka Korpela
http://www.amazon.com/dp/059610121X/
up
0
jgray at triangle dash solutions dot com
11 years ago
Lowercase alphabet:
<?php for($a=97;$a<(97+26);$a++){ echo chr($a); } ?>
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0
webmaster at project-enigma dot net
12 years ago
\n == &#13;
Usefull if u want to display multi-line-alt-strings
e.g. <img src="/gifs/php_logo.gif" alt="Here u can see the&#13;PHPLogo&#13;3rd line">
up
-2
grey - greywyvern - com
9 years ago
I spent hours looking for a function which would take a numeric HTML entity value and output the appropriate UTF-8 bytes.  I found this at another site and only had to modify it slightly; so I don't take credit for this.

<?php function unichr($dec) {
  if (
$dec < 128) {
   
$utf = chr($dec);
  } else if (
$dec < 2048) {
   
$utf = chr(192 + (($dec - ($dec % 64)) / 64));
   
$utf .= chr(128 + ($dec % 64));
  } else {
   
$utf = chr(224 + (($dec - ($dec % 4096)) / 4096));
   
$utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
   
$utf .= chr(128 + ($dec % 64));
  }
  return
$utf;
}
?>

So for example:

<?php

  $str
= "Chinese: &#20013;&#25991;";
 
$str = preg_replace("/&#(\d{2,5});/e", "unichr($1);", $str);

?>
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-1
scott at quinlan dot co dot nz
6 years ago
Secure password generator with a variable maximum amount of symbols.

<?php

function passwdGen($minLength = 8, $maxLength = 12, $maxSymbols = 2)
{
   
$symbolCount = 0;

   
srand((double)microtime() * 1000003);

    for (
$i = 0; $i < rand($minLength, $maxLength); $i++)
    {
        do
        {
           
$char = rand(33, 126);

           
$symbolCount += $isSymbol = (!in_array($char, range(48, 57)) && !in_array($char, range(65, 90)) && !in_array($char, range(97, 122)));

            if (
$symbolCount <= $maxSymbols || !$isSymbol)
            {
                break;
            }
        }
        while (
true);

       
$passwd = sprintf('%s%c', isset($passwd) ? $passwd : NULL, $char);
    }

    return
$passwd;
}

?>
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-1
infoserv at chollian dot net
11 years ago
Cutting Korean(2Byte)-String

<?php
function cutStr($str,$len){
    if(
strlen($str) > $len){
       
$str = substr($str,0,$len - 2);
        if(
strlen(substr(strrchr($str," "),1)) % 2)
           
$str = substr($str,0,strlen($str) - 1);
       
$str .= "..";
    }
    return
$str;
}
?>
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-2
jacob at loggy punt nl
5 years ago
This function creates a ascii table, and replaces all the ascii characters in the mail.
---
Deze functie maakt een ascii tabel, en zet alles juist om.

<?php
function makeASCII($a){
 
$find[] = "=\r\n";
 
$replace[] = "";

  for(
$i=0; $i < 256; $i++){
   
$find[] = "=".dechex($i)."";
   
$replace[] = chr($i);
  }
 
$a = str_replace($find,$replace,$a);
  return
$a;
}
?>
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-2
mwgamera at gmail dot com
8 years ago
Unicode version of chr() using mbstring
<?php
 
function unichr($u) {
    return
mb_convert_encoding(pack("N",$u), mb_internal_encoding(), 'UCS-4BE');
  }
?>
It returns a string in internal encoding (possibly more than one byte).
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