1 <?php
2 // 显示汉字
3 header('content-type: text/html;charset = utf-8');
4
5 /* preg_match($pattern, $subject, [array &$matches]) 第三个参数可选，也是引用参数
6 preg_match_all($pattern, $subject, array &$matches)
7
8 return 匹配到结果的次数;
9 */
10 $pattern = '/[0-9]/';
11 $subject = 'weuyr3ui76as83s0ck9';
12
13 $m1 = $m2 = array();
14
15 $t1 = preg_match($pattern, $subject, $m1);
16 $t2 = preg_match_all($pattern, $subject, $m2);
17
18 show($m1);
19 echo '<hr />';
20 show($m2);
21 echo '<hr />';
22 echo '$t1 & $t2 的返回值：';
23 show($t1.'||'.$t2);
24
25 // 对输出做个判断，选择合适的输出方式
26 function show($var = null){
27 if(empty($var)){
28 echo 'null';
29 }elseif(is_array($var) || is_object($var)){
30 //array, object
31 echo '<pre>';
32 print_r($var);
33 echo '</pre>';
34 }else{
35 //string, int, float...
36 echo $var;
37 }
38 }
