<?php
$str = ‘string‘;
$chars = preg_split(‘//‘, $str, -1, PREG_SPLIT_NO_EMPTY);
print_r($chars);
?>  


以上例程会输出：


Array
(
    [0] => s
    [1] => t
    [2] => r
    [3] => i
    [4] => n
    [5] => g
)