PHP check if file is an image [duplicate]

Question

Is there a way to make sure a received file is an image in PHP?

Testing for the extension doesn't sound very secure to me as you could upload a script and change its extension to whatever you want.

I've tried to use getimagesize too, but there might be something more suited for that particular problem.

Answer 1

The getimagesize() should be the most definite way of working out whether the file is an image:

if(@is_array(getimagesize($mediapath))){     $image = true; } else {     $image = false; } 

because this is a sample getimagesize() output:

Array ( [0] => 800 [1] => 450 [2] => 2 [3] => width="800" height="450" [bits] => 8 [channels] => 3 [mime] => image/jpeg)