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    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

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    User Contributed Notes 8 notes

    up
    62
    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
    51
    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
    48
    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
    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
    3
    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
    7
    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
    0
    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);
    ?>
    up
    -3
    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.
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