Confirmation of my regex attempt

[NotionCommotion]

I have possible HTTP_REFERER values such as the following:

[HTTP_REFERER] => http://www.example.com/lib/index.php?cid=components&controller=data&id=17&roles_id=15
[HTTP_REFERER] => http://www.example.com/lib/index.php?cid=createhelp

I am just trying to get the value of "cid"  Note that this applies to a TinyMCE plugin, and my $_GET variable does not include "cid".  Looking at my $_SERVER array, HTTP_REFERER is the only element that includes "cid".  I am also not concerned about spoofing HTTP_REFERER.

 

I am getting the value of "cid" as follows.  Is this the right way to do so?

$RegExp = '/index\.php\?cid=([^&]+)/';
preg_match($RegExp, $_SERVER['HTTP_REFERER'], $matches);
exit($matches[1]);

[Ch0cu3r]

Use parse_url to get the query string. Then use parse_str to get the cid parameter

$query_string = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY);
parse_str($query_string, $param);

echo $param['cid']; // return cid value

Edited December 12, 2014 by Ch0cu3r

[NotionCommotion]

Thanks ChOcu3r,  Much nicer!  Wish I didn't waste the time trying to use regex, but then again, I need the experience!