条件语句中的PHP“或”运算符 - newb问题！

Question

Forgive me if this has been covered before, I searched to no avail.

I have a script that looks into a directory to find the files inside. There is a conditional line that only looks for files with a certain extension:

if(strtolower(substr($file, -3)) == "mp4"){...

So that will only look for files with an 'mp4' extension.

I need to add some "or" operators to add two more extension types. I tried the following but it didn't work:

if(strtolower(substr($file, -3)) == "mp4" || == "mov" || == "flv"){...

Now the line seems to be ignored and it gets every file in the directory. If anyone could help me out, I'd be very grateful! I know this is probably as basic as it gets, but my grasp of PHP is extremely limited (although I do see its beauty!!!)

Thanks in advance.

Answer 1

 $ext = strtolower(substr($file, -3));

 if($ext == "mp4" || $ext == "mov" || $ext == "flv"){...