1 <?php
 2 $url = 'http://www.baidu.com/index.php?m=content&c=index&a=lists&catid=6&area=0&author=0&h=0®ion=0&s=1&page=1';
 3 $arr = parse_url($url);
 4 var_dump($arr);
 5 $arr_query = convertUrlQuery($arr['query']);
 6 var_dump($arr_query);
 7 var_dump(getUrlQuery($arr_query));
 8 /**
 9  * 将字符串参数变为数组
10  * @param $query
11  * @return array array (size=10)
12           'm' => string 'content' (length=7)
13           'c' => string 'index' (length=5)
14           'a' => string 'lists' (length=5)
15           'catid' => string '6' (length=1)
16           'area' => string '0' (length=1)
17           'author' => string '0' (length=1)
18           'h' => string '0' (length=1)
19           'region' => string '0' (length=1)
20           's' => string '1' (length=1)
21           'page' => string '1' (length=1)
22  */
23 function convertUrlQuery($query)
24 {
25   $queryParts = explode('&', $query);
26   $params = array();
27   foreach ($queryParts as $param) {
28     $item = explode('=', $param);
29     $params[$item[0]] = $item[1];
30   }
31   return $params;
32 }
33 /**
34  * 将参数变为字符串
35  * @param $array_query
36  * @return string string 'm=content&c=index&a=lists&catid=6&area=0&author=0&h=0®ion=0&s=1&page=1' (length=73)
37  */
38 function getUrlQuery($array_query)
39 {
40   $tmp = array();
41   foreach($array_query as $k=>$param)
42   {
43     $tmp[] = $k.'='.$param;
44   }
45   $params = implode('&',$tmp);
46   return $params;
47 }