URI处理函数

function modifyUri($param = '', $value = '') { 
 2     //获取当前页面URI 
 3     $uri = $_SERVER['REQUEST_URI']; 
 4     $uri = (parse_url($uri)); 
 5     //将URI分割成数组并删除数组中重复的项 
 6     $uri = explode('&', $uri['query']); 
 7     $uri = array_unique($uri); 
 8     //判断函数是否有值传入，有则执行替换/插入 
 9     if ('' != $param && '' != $value) {
10         $param .= '=';
11         $param_erge = '/'.$param.'.*/';
12         //检测URI里是否已存在要替代的URI，有则替换
13         $uri = preg_replace($param_erge ,$param.$value , $uri);
14         //如不存在则添加至末尾     
15         if('1' != in_array($param.$value, $uri)) array_push($uri, $param.$value);
16     }
17     //将数组转换成字符串并返回
18     $uri = implode('&', $uri);
19     $u = substr($_SERVER['REQUEST_URI'] , 0 , strpos($_SERVER['REQUEST_URI'] , '?'));
20     $uri = "{$u}?".$uri;
21     return $uri;
22 }