Php取扩展名

/**
* 取扩展名
*/

function getext($url){
    $base = parse_url($url);
    $name = basename($base['path']);
    $ext = explode('.',$name);
    var_dump($ext[count($ext)-1]);
}

$url = 'https://www.baidu.com/game/tkdz.php?id=1.5';
getext($url);