(PHP) Regular expression-preg_grep function usage

<?php
/**
 * Created by PhpStorm.
 * User: Ollydebug
 * Date: 2015/11/13
 * Time: 22:55
 */

//阉割版preg_filter
//preg_grep函数只会去做匹配的操作，不做替换

$pattern = &#39;/[0-9]/&#39;;
$subject = array(&#39;weuy&#39;,&#39;r3ui&#39;,&#39;76as83&#39;,&#39;s&#39;,&#39;0ck9&#39;);

$arr = preg_grep($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;