mb_substr_count
Passing null as length will not make mb_substr use it's default, instead it will interpret it as 0.
<?php
mb_substr($str,$start,null,$encoding); //Returns '' (empty string) just like substr()
?>
Instead use:
<?php
mb_substr($str,$start,mb_strlen($str),$encoding);
?>
mb_substr
(PHP 4 >= 4.0.6, PHP 5)
mb_substr — Obtiene parte de una cadena de caracteres
Descripción
string mb_substr
( string
$str
, int $start
[, int $length
[, string $encoding
]] )
Realiza una operación
substr() multibyte de forma segura basada
en el número de caracteres. La posición se cuenta
desde el principio de
str. La posición del primer carácter es
0. La posición del segundo es 1, etc.
Parámetros
-
str -
El string de donde extraer la parte deseada.
-
start -
La posición del primer carácter a usar de
str. -
length -
El número máximo de caracteres a usar de
str. -
encoding -
El parámetro
encodinges la codificación de caracteres. Si es omitido, será usado el valor de la codificación de caracteres interna.
Valores devueltos
mb_substr() devuelve una parte de
str especificada por los parametros
start y
length.
Ver también
- mb_strcut() - Obtener parte de un string
- mb_internal_encoding() - Establece/obtiene la codificación de caracteres interna
add a note
User Contributed Notes
mb_substr - [10 notes]
Silvan ¶
5 years ago
Anonymous ¶
3 years ago
If start is negative, the returned string will start at the start'th character from the end of string
qeremy [atta] gmail [dotta] com ¶
1 year ago
A proper (logical) alternative for unicode strings;
<?php
function substr_unicode($str, $s, $l = null) {
return join("", array_slice(
preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY), $s, $l));
}
$str = "Büyük";
$s = 0; // start from "0" (nth) char
$l = 3; // get "3" chars
echo substr($str, $s, $l) ."\n"; // Bü
echo mb_substr($str, $s, $l) ."\n"; // Bü
echo substr_unicode($str, $s, $l); // Büy
?>
xiaogil at yahoo dot fr ¶
7 years ago
Thanks Darien from /freenode #php for the following example (a little bit changed).
It just prints the 6th character of $string.
You can replace the digits by the same in japanese, chinese or whatever language to make a test, it works perfect.
<?php
mb_internal_encoding("UTF-8");
$string = "0123456789";
$mystring = mb_substr($string,5,1);
echo $mystring;
?>
(I couldn't replace 0123456789 by chinese numbers for example here, because it's automatically converted into latin digits on this website, look :
零一二三四
五六七八九)
gilv
levani9191 at gmail dot com ¶
2 years ago
A simple code that check if the latest symbol in the string is a question mark and adds one if it doesn't...
<?php $string = (mb_substr($string, -1, 1, 'UTF-8') != '?') ? $string.'?' : $string; ?>
desmatic at gmail dot com ¶
23 days ago
quick and dirty loop through multibyte string
<?php
function get_character_classes($string, $encoding = "UTF-8") {
$current_encoding = mb_internal_encoding();
mb_internal_encoding($encoding);
$has = array();
$stringlength = mb_strlen($string, $encoding);
for ($i=0; $i < $stringlength; $i++) {
$c = mb_substr($string, $i, 1);
if (($c >= "0") && ($c <= "9")) {
$has['numeric'] = "numeric";
} else if (($c >= "a") && ($c <= "z")) {
$has['alpha'] = "alpha";
$has['alphalower'] = 'alphalower';
} else if (($c >= "A") && ($c <= "Z")) {
$has['alpha'] = "alpha";
$has['alphaupper'] = "alphaupper";
} else if (($c == "$") || ($c == "£")) {
$has['currency'] = "currency";
} else if (($c == ".") && ($has['decimal'])) {
$has['decimals'] = "decimals";
} else if ($c == ".") {
$has['decimal'] = "decimal";
} else if ($c == ",") {
$has['comma'] = "comma";
} else if ($c == "-") {
$has['dash'] = "dash";
} else if ($c == " ") {
$has['space'] = "space";
} else if ($c == "/") {
$has['slash'] = "slash";
} else if ($c == ":") {
$has['colon'] = "colon";
} else if (($c >= " ") && ($c <= "~")) {
$has['ascii'] = "ascii";
} else {
$has['binary'] = "binary";
}
}
mb_internal_encoding($current_encoding);
return $has;
}
$string = "1234asdfA£^_{}|}~žščř";
echo print_r(get_character_classes($string), true);
?>
Array
(
[numeric] => numeric
[alpha] => alpha
[alphalower] => alphalower
[alphaupper] => alphaupper
[currency] => currency
[ascii] => ascii
[binary] => binary
)
projektas at gmail dot com ¶
4 years ago
First letter in upper case <hr />
<?php
header ('Content-type: text/html; charset=utf-8');
if (isset($_POST['check']) && !empty($_POST['check'])) {
echo htmlspecialchars(ucfirst_utf8($_POST['check']));
} else {
echo htmlspecialchars(ucfirst_utf8('Žąsinų'));
}
function ucfirst_utf8($str) {
if (mb_check_encoding($str,'UTF-8')) {
$first = mb_substr(
mb_strtoupper($str, "utf-8"),0,1,'utf-8'
);
return $first.mb_substr(
mb_strtolower($str,"utf-8"),1,mb_strlen($str),'utf-8'
);
} else {
return $str;
}
}
?>
<form method="post" action="" >
<input type="input" name="check" />
<input type="submit" />
</form>
drraf at tlen dot pl ¶
8 years ago
Note: If borders are out of string - mb_string() returns empty _string_, when function substr() returns _boolean_ false in this case.
Keep this in mind when using "===" comparisions.
Example code:
<?php
var_dump( substr( 'abc', 5, 2 ) ); // returns "false"
var_dump( mb_substr( 'abc', 5, 2 ) ); // returns ""
?>
It's especially confusing when using mbstring with function overloading turned on.
p dot assenov at aip-solutions dot com ¶
1 year ago
I'm trying to capitalize only the first character of the string and tried some of the examples above but they didn't work. It seems mb_substr() cannot calculate the length of the string in multi-byte encoding (UTF-8) and it should be set explicitly. Here is the corrected version:
<?php
function mb_ucfirst($str, $enc = 'utf-8') {
return mb_strtoupper(mb_substr($str, 0, 1, $enc), $enc).mb_substr($str, 1, mb_strlen($str, $enc), $enc);
}
?>
cheers!
dziamid at gmail dot com ¶
4 years ago
Here is my solution to highlighting search queries in multibyte text:
<?php
function mb_highlight($data, $query, $ins_before, $ins_after)
{
$result = '';
while (($poz = mb_strpos(mb_strtolower($data), mb_strtolower($query))) !== false)
{
$query_len = mb_strlen ($query);
$result .= mb_substr ($data, 0, $poz).
$ins_before.
mb_substr ($data, $poz, $query_len).
$ins_after;
$data = mb_substr ($data, $poz+$query_len);
}
return $result;
}
?>
Enjoy!
[EDIT BY danbrown AT php DOT net: Reclassified to a more appropriate function manual page.]