ConFoo 2025

mb_split

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

mb_split使用正则表达式分割多字节字符串

说明

mb_split(string $pattern, string $string, int $limit = -1): array|false

使用正则表达式 pattern 分割多字节 string 并返回结果 array

参数

pattern

正则表达式。

string

待分割的 string

limit
如果指定了可选参数 limit,将最多分割为 limit 个元素。

返回值

结果为 array, 或者在失败时返回 false

注释

注意:

The character encoding specified by mb_regex_encoding() will be used as the character encoding for this function by default.

参见

添加备注

用户贡献的备注 8 notes

up
73
Stas Trefilov, Vertilia
9 years ago
a (simpler) way to extract all characters from a UTF-8 string to array with a single call to a built-in function:

<?php
$str
= 'Ма-
руся'
;
print_r(preg_split('//u', $str, null, PREG_SPLIT_NO_EMPTY));
?>

Output:

Array
(
[0] => М
[1] => а
[2] => -
[3] =>

[4] => р
[5] => у
[6] => с
[7] => я
)
up
59
boukeversteegh at gmail dot com
13 years ago
The $pattern argument doesn't use /pattern/ delimiters, unlike other regex functions such as preg_match.

<?php
# Works. No slashes around the /pattern/
print_r( mb_split("\s", "hello world") );
Array (
[
0] => hello
[1] => world
)

# Doesn't work:
print_r( mb_split("/\s/", "hello world") );
Array (
[
0] => hello world
)
?>
up
49
adjwilli at yahoo dot com
16 years ago
I figure most people will want a simple way to break-up a multibyte string into its individual characters. Here's a function I'm using to do that. Change UTF-8 to your chosen encoding method.

<?php
function mbStringToArray ($string) {
$strlen = mb_strlen($string);
while (
$strlen) {
$array[] = mb_substr($string,0,1,"UTF-8");
$string = mb_substr($string,1,$strlen,"UTF-8");
$strlen = mb_strlen($string);
}
return
$array;
}
?>
up
12
gunkan at terra dot es
12 years ago
To split an string like this: "日、に、本、ほん、語、ご" using the "、" delimiter i used:

$v = mb_split('、',"日、に、本、ほん、語、ご");

but didn't work.

The solution was to set this before:

mb_regex_encoding('UTF-8');
mb_internal_encoding("UTF-8");
$v = mb_split('、',"日、に、本、ほん、語、ご");

and now it's working:

Array
(
[0] => 日
[1] => に
[2] => 本
[3] => ほん
[4] => 語
[5] => ご
)
up
22
boukeversteegh at gmail dot com
14 years ago
In addition to Sezer Yalcin's tip.

This function splits a multibyte string into an array of characters. Comparable to str_split().

<?php
function mb_str_split( $string ) {
# Split at all position not after the start: ^
# and not before the end: $
return preg_split('/(?<!^)(?!$)/u', $string );
}

$string = '火车票';
$charlist = mb_str_split( $string );

print_r( $charlist );
?>

# Prints:
Array
(
[0] => 火
[1] => 车
[2] => 票
)
up
2
thflori at gmail
7 years ago
I agree that some people might want a mb_explode('', $string);

this is my solution for it:

<?php

$string
= 'Hallöle';

$array = array_map(function ($i) use ($string) {
return
mb_substr($string, $i, 1);
},
range(0, mb_strlen($string) -1));

expect($array)->toEqual(['H', 'a', 'l', 'l', 'ö', 'l', 'e']);

?>
up
-1
gert dot matern at web dot de
15 years ago
We are talking about Multi Byte ( e.g. UTF-8) strings here, so preg_split will fail for the following string:

'Weiße Rosen sind nicht grün!'

And because I didn't find a regex to simulate a str_split I optimized the first solution from adjwilli a bit:

<?php
$string
= 'Weiße Rosen sind nicht grün!'
$stop = mb_strlen( $string);
$result = array();

for(
$idx = 0; $idx < $stop; $idx++)
{
$result[] = mb_substr( $string, $idx, 1);
}
?>

Here is an example with adjwilli's function:

<?php
mb_internal_encoding
( 'UTF-8');
mb_regex_encoding( 'UTF-8');

function
mbStringToArray
( $string
)
{
$stop = mb_strlen( $string);
$result = array();

for(
$idx = 0; $idx < $stop; $idx++)
{
$result[] = mb_substr( $string, $idx, 1);
}

return
$result;
}

echo
'<pre>', PHP_EOL,
print_r( mbStringToArray( 'Weiße Rosen sind nicht grün!', true)), PHP_EOL,
'</pre>';
?>

Let me know [by personal email], if someone found a regex to simulate a str_split with mb_split.
up
-2
qdb at kukmara dot ru
14 years ago
an other way to str_split multibyte string:
<?php
$s
='әӘөүҗңһ';

//$temp_s=iconv('UTF-8','UTF-16',$s);
$temp_s=mb_convert_encoding($s,'UTF-16','UTF-8');
$temp_a=str_split($temp_s,4);
$temp_a_len=count($temp_a);
for(
$i=0;$i<$temp_a_len;$i++){
//$temp_a[$i]=iconv('UTF-16','UTF-8',$temp_a[$i]);
$temp_a[$i]=mb_convert_encoding($temp_a[$i],'UTF-8','UTF-16');
}

echo(
'<pre>');
print_r($temp_a);
echo(
'</pre>');

//also possible to directly use UTF-16:
define('SLS',mb_convert_encoding('/','UTF-16'));
$temp_s=mb_convert_encoding($s,'UTF-16','UTF-8');
$temp_a=str_split($temp_s,4);
$temp_s=implode(SLS,$temp_a);
$temp_s=mb_convert_encoding($temp_s,'UTF-8','UTF-16');
echo(
$temp_s);
?>
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