preg_split()

<?php
/*
    preg_split($pattern, $subject)
    explode(...)是其子集
*/
    header('content-type: text/html;charset = utf-8');

    $pattern = '/[0-9]/';
    $subject = '慕3女2神,5约吗';

    $arr = preg_split($pattern, $subject);

    show($arr);


    // 对输出做个判断，选择合适的输出方式
    function show($var = null){
        if(empty($var)){
            echo 'null';
        }elseif(is_array($var) || is_object($var)){
            //array, object
            echo '<pre>';
            print_r($var);
            echo '</pre>';
        }else{
            //string, int, float...
            echo $var;
        }
    }