(PHP) Regular expression-preg_quote-Usage of escaped regular expression characters

<?php
/**
 * Created by PhpStorm.
 * User: Ollydebug
 * Date: 2015/11/15
 * Time: 10:20
 */

//preg_quote-转义正则表达式字符
//preg_quote()需要参数 str 并向其中 每个正则表达式语法中的字符前增加一个反斜线。这通常用于你有一些运行时字符串 需要作为正则表达式进行匹配的时候

$str = &#39;qwer{asdf}[1234]&#39;;

$str = preg_quote($str);

show($str);

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;

';     }else{         //string,int,float         echo $var;     } } ?>

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