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// Ordered by execution speed

$ext = pathinfo($filename, PATHINFO_EXTENSION);

$ext = substr(strrchr($filename, '.'), 1);

$ext = substr($filename, strrpos($filename, '.') + 1);

$ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $filename);

$ext = end(explode('.', $filename));