Checking to see if URL includes something... how do I do this?

[Snorkel]

I need a simple script that checks if the URL includes a specific string of text, and if it does, do something, if it doesn't, do something else. I know this can be accomplished with an if/else function, which I can do, but I don't know how to do the checking the URL part.

 

 

[trq]

To get a url (file) into a string use file_get_contents, once you have the file in a string you can simply use strpos to see if it contains a certain string.