How to remove beginning up to end of searched 2 characters?

[us2rn4m2]

Code: Select all

$url = 'https://www.fb.com/SmilePg/posts/320187951230342';
echo substr(strrchr($url, '/'), 1);  // 320187951230342

http://www.php.net/manual/en/function.parse-url.php
http://www.php.net/manual/en/book.strings.php