preg_replace()与preg_filter()

<?php
/*
    preg_replace($pattern, $replacement, $subject)
    preg_filter($pattern, $replacement, $subject)
*/
header('content-type: text/html;charset = utf-8');

//$pattern = '/[0-9]/';
$pattern = array('/[0123]/', '/[456]/', '/[789]/');
//$subject = 'weuyr3ui76as83s0ck9';
$subject = array('weuy', 'r3ui', '76as83', 's', '0ck9');
//$replacement = '慕女神';
$replacement = array('慕', '女', '神');

$str1 = preg_replace($pattern, $replacement, $subject);
$str2 = preg_filter($pattern, $replacement, $subject);

show($str1);
echo '<hr />';
show($str2);

// 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;
    }
}