如何从URL中提取参数并使用PHP将每个参数存储在一个新变量中[复制]

Question

Possible Duplicate:
How to grab URL parameters using PHP?

I was wondering how can I store each url parameter each in there own new variable when I don't know how deep the url parameters are?

Here is an example of a URL value.

http://www.localhost.com/topics/index.php?cat=3&sub1=sub-1&sub2=sub-2&sub3=sub-3&sub4=sub-4

Here is my PHP script.

 $url = $_SERVER['QUERY_STRING'];
 $query = array();

 if(!empty($url)){
   foreach(explode('&', $url) as $part){
   list($key, $value) = explode('=', $part, 2);
   $query[$key] = $value;
  }
 }

Answer 1

PHP has this functionality already built in.

$query = parse_str($url);
extract($query)

// example
if(isset($sub1)) {
  echo $sub1;
}

see parse_str for more information