Tutorial Find File Extension

Method 1
function findexts ($filename) {

$filename = strtolower($filename) ;

$exts = split("[/\\.]", $filename) ;

$n = count($exts)-1;

$exts = $exts[$n];

return $exts;

}
Method 2
$filename = 'mypic.gif';
$ext = pathinfo($filename, PATHINFO_EXTENSION);
Method 3
function getFileextension($file) {
return end(explode(".", $file));
}