How do I parse a query string that has an embedded '&'?

Question

In PHP, how would I parse the following query string to get the entire variable "url" which should contain everything after it?

http://www.mydomain.com/?c=log&m=index&url=https://www.facebook.com/logout.php?next=http%3A%2F%2Fwww.anotherdomain.com&access_token=AAACPpB5pr5gBAJLFZBGaU6SM7UMlGQob7QUBf3aI0DIHrHWtcTGHirS0UrwwDDZBEiIQHeWfkOVCFbEXrFt6TdVlbPrXmV6xyPDI9pPQZDZD

$_GET['url'] drops everything after 'www.anotherdomain.com' because it encounters another '&'.

The problem is that 'url' is provided by Facebook. If I urlencode the entire string, it becomes invalid. How would I parse 'url' to programmatically urlencode only the piece that needs to be changed?

alex · Accepted Answer · 2012-02-03 07:19:19Z

2

try something like this

 $link = "http://www.mydomain.com/?c=log&m=index&url=";
 $link .= rawurlencode('https://www.facebook.com/logout.php?next=http%3A%2F%2Fwww.anotherdomain.com');
 $link .= '&access_token=AAACPpB5pr5gBAJLFZBGaU6SM7UMlGQob7QUBf3aI0DIHrHWtcTGHirS0UrwwDDZBEiIQHeWfkOVCFbEXrFt6TdVlbPrXmV6xyPDI9pPQZDZD';

to retrireve the data use

  $url_get = rawurldecode($_GET['url']);

edited Feb 3, 2012 at 7:19

answered Feb 3, 2012 at 6:50

alex

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2 Comments

Quentin Over a year ago

Half the point of $_GET is that it decodes the data for you. So you don't need to decode it manually.

Quentin Over a year ago

Your first chunk of code changes the name of the variable half way through … then changes it back.

Niet the Dark Absol · Accepted Answer · 2012-02-03 06:38:51Z

2

The url should be urlencoded before being passed, otherwise it is an invalid query string parameter.

answered Feb 3, 2012 at 6:38

Niet the Dark Absol

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