Fatal error: Call to undefined function file_extension()

[ansipants]

when I try to upload the image on submit, I get there following error:

 

Fatal error: Call to undefined function file_extension() in editlogo.php on line 41

Line 41 is the very last line of the code.

// get form data, making sure it is valid
	$img_name = $_FILES['myimage']['name'];
        $tmp_name = $_FILES['myimage']['tmp_name'];
        $img_size = $_FILES['myimage']['size'];
        
        if ($img_name) {
            
            if ($img_size>2097152) {
                die('Max image size is 2mb!');

           } else {
                $file_ext = file_extension($img_name);

[Buddski]

Do you have a function called file_extension?

[ansipants]

well i didn't then I put it in and I got a few errors then i pretty much destroyed the whole thing so, back to the drawing board from scratch  :'(

[trq]

The error is pretty self explanatory.