PHP if becomes partially equal to?

EDIT
I changed it to..

But it is still processing between the {} tags regardless of what directory it is. I changed it to 43523 and it still outputs information.... Any ideas?
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I think I'm probably going about this the wrong way but basically, I'm making a template system for a series of websites that will sit in directories on the domain e.g.

domain.com/site1/
domain.com/site2/

I'm only using includes to include template files and using the URL to relate the files:

// Get url
$url="http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

// Relate url to website
if ($url = "http://www.domain.com/site1/index.php"){
$siteid = "4";
$sitename = "Foo";
$logo = "logo.png";
}

PHP:

I got this far and everything works perfectly, it pulls from the db etc on the homepage but I just realised that as soon as I add another page, it won't work.

Is there a way to get the directory from the URL and relate the siteid to the /site1/ directory?

 

I think you mean == instead of =, please see => http://php.net/manual/en/language.operators.comparison.php