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I found that I can use the function str_split

I have done string comparison before using the lcs algorithm, which involves breaking up strings into arrays. Due to Chinese issues, it is not possible to use str_split directly. You need to use preg_split

你可以封裝一個(gè)公共函數(shù)

function mb_str_split($str)
{
    return preg_split('/(?<!^)(?!$)/u' , $str);
}

$string = '中國(guó)共產(chǎn)黨萬(wàn)歲！aaaaa';
var_dump(preg_split('//u', $string, 0, PREG_SPLIT_NO_EMPTY));
/*
array (size=13)
  0 => string '中' (length=3)
  1 => string '國(guó)' (length=3)
  2 => string '共' (length=3)
  3 => string '產(chǎn)' (length=3)
  4 => string '黨' (length=3)
  5 => string '萬(wàn)' (length=3)
  6 => string '歲' (length=3)
  7 => string '！' (length=3)
  8 => string 'a' (length=1)
  9 => string 'a' (length=1)
  10 => string 'a' (length=1)
  11 => string 'a' (length=1)
  12 => string 'a' (length=1)
 */

preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);

The string itself can be used as an array
$str = "abcdef";
You output $str[0].$str[1].$str[2];
You will find that it is actually $str
array(" a","b","c","d","e","f");

$str = 'adfdf';
$arr = [];
for($i=0;$i<strlen($str);$i++) {
$arr[$i] = $str{$i};
}

var_dump($arr);

$str = 'adfdf';
preg_match_all('/(\w{1})/', $str, $matches);
var_dump($matches[0]);

$str = 'adfdf';
$temp = array();
for ($i = 0; $i < strlen($str); $i++) {
    array_push($temp, $str{$i});
}
var_dump($temp);

$str = 'adfdf';

    $len = mb_strlen($str);
    $arr = [];
    if(!isset($str[0])) {
        exit('輸入合理字符串！');
    }
    $rb = function ($index = 0) use (&$rb, &$arr, $str, $len) {
         array_push($arr, mb_substr($str, $index, 1,'UTF-8'));
        $index++;
        if ($index == $len) return $arr;
        $rb($index);
    };
    $rb();
    header("Content-type: text/html; charset=UTF-8");
   var_dump($arr);

<?php
$str = 'adfdf';
$arr = array();
for($i=0;$i<strlen($str);$i++) {
$arr[$i] = $str[$i];
}
print_r($arr);
?>

explode doesn’t work?