(PHP)正则表达式-preg_replace()和preg_filter()

<?php
/**
 * 正则表达式练习
 * User: Ollydebug
 * Date: 2015/11/13
 * Time: 13:28
 */

/*
 * preg_replace()不论发不发生替换，值都保留.
 * preg_filter()只保留发生替换的值.
 */

$pattern = array('/[0123]/','/[456]/','/[789]/');
$subject = array("weuy","r3ui","76as83","s","0ck9");
$replacement = array('百','小','度');
$str1 = preg_replace($pattern,$replacement,$subject);
$str2 = preg_filter($pattern,$replacement,$subject);

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

function show($var){
    if(empty($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;
    }
}

?>

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