<?php

$found = true;

if ( $_SERVER['REQUEST_URI'] == '/' ) $page = 'landing';
else {
    $page = substr($_SERVER['REQUEST_URI'], 1);
    $vardu = $page;
    if ( !preg_match('/^[A-z0-9/-]{3,16}$/', $page) ) $found = false;
}

if ($found) {
    if ( file_exists('/'.$page.'.php') ) include '/'.$page.'.php';
    else $found = false;
}

if (!$found) {
    echo '404';
}

?>

echo $_SERVER['REMOTE_ADDR'];

if ( $_SERVER['REQUEST_URI'] == '/' ) $page = 'landing';
else {
    $page = substr($_SERVER['REQUEST_URI'], 1);
    $vardu = $page;
    if ( !preg_match('/^[A-z0-9/-]{3,16}$/', $page) ) $found = false;
    if (твои айпи != $_SERVER['REMOTE_ADDR']) $found = false;
}