function findexts ($filename)
{
$filename = strtolower($filename) ;
$exts = split("[/\\.]", $filename) ;
$n = count($exts)-1;
$exts = $exts[$n];
return $exts;
}
Basically what the code is doing is first using strtolower to change the extension (and the whole file name) into lower case, just to keep it clean. Next we are splitting the filename into an array using split. By splitting it at the [.] the extension will be the last element in the array, which we then return.
