1 <?php
2 /*
3 preg_quote($str) 平时不常用
4 正则运算符转义
5 . \ + * ? ^ [ ] $ ( ) { } = ! < > | : -
6 */
7 header('content-type: text/html;charset = utf-8');
8
9 $str = 'qwer{asdf}[1234]';
10
11 $str = preg_quote($str);
12
13 show($str);
14
15 // 对输出做个判断，选择合适的输出方式
16 function show($var = null){
17 if(empty($var)){
18 echo 'null';
19 }elseif(is_array($var) || is_object($var)){
20 //array, object
21 echo '<pre>';
22 print_r($var);
23 echo '</pre>';
24 }else{
25 //string, int, float...
26 echo $var;
27 }
28 }
