<?php
$url ="[::1]/challenges/flag.php";
if (preg_match ('/[https?|[st]?ftp|dict|gopher|scp|telnet|ldaps?]\:\/\/.*(\d+|[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})/i', $url)) {
die('Please do not access by IP.');
} elseif (preg_match ('/localhost/i', $url)) {
die ('Please do not access localhost.');
}
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0