(PHP) Regular expression-Usage of preg_split function

<?php
/**
 * Created by PhpStorm.
 * User: Ollydebug
 * Date: 2015/11/15
 * Time: 10:13
 */

//preg_split-升级版explode函数
//preg_split的主要意思是通过一个正则表达式分割字符串

$pattern = &#39;/[0-9]/&#39;;
$subject = &#39;钻3石2星5尘4拳&#39;;

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

show($arr);

function show($var){
    if(empty($var)){
        echo &#39;null&#39;;
    }elseif(is_array($var)||is_object($var)){
        // array,object
        echo &#39;<pre class="brush:php;toolbar:false">&#39;;
        print_r($var);
        echo &#39;