- preg_match: documentation ( source)
- parse_url: documentation ( source)
<?php
$string = "http://127.0.0.1:3333/item/id/3";
$path = parse_url($string, PHP_URL_PATH);
$pattern = '[^\/]+$';
preg_match($pattern, $path, $matches);
echo $matches[1];
//echo $path;