PHP: How to check whether the URL is Youtube's or vimeo's

Question

How can I write a function to check whether the provided URLs is youtube or vimeo?

For instance, I have this two URLs that I store in a database as strings,

Answer 1

Since all you want to do is check for the presence of a string, use stripos. If it doesn't have youtube.com or vimeo.com in it, the url is malformed, right? stripos is case insensitive, too.

if(stripos($url,'youtu')===false){
    //must be vimeo
    } else {
    //is youtube
    }