File::suffix() 

\nn\t3::File()->suffix($filename = NULL); 

Returns the suffix of the file

\nn\t3::File()->suffix('image.jpg'); => returns 'jpg'
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| @return string

Source Code 

public function suffix($filename = null)
{
	if (!$filename) return false;
	$suffix = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
	$suffix = preg_replace('/\?.*/', '', $suffix);
	if ($suffix == 'jpeg') $suffix = 'jpg';
	return $suffix;
}
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