preg_grep()

<?php
/*
    preg_grep($pattern, array $input)
    阉割版preg_filter(...) 只匹配不替换
*/

header('content-type: text/html;charset = utf-8');

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

$arr = preg_grep($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;
    }
}