PHP get URL suffix name

I saw that many interview questions have this topic, so I realized it.

Code:

<?php

// PHP获取URL后缀名

$url = (string) 'https://blog.csdn.net/u012628581/test.php';

try {
    $ext = pathinfo($url, PATHINFO_EXTENSION);
    if (!$ext) {
        throw new \Exception('parse extension error,'.$url);
    }
    echo $ext;
} catch (\Exception $e) {
    echo 'Message:',$e->getMessage(); // log
}123456789101112131415

Look at the Internet and there are solutions such as regular or string matching, but the most efficient is the system function.