index_dev.php

<?php

if (php_sapi_name() !== 'cli-server') {
    exit('Unauthorized access denied.');
}

define('DEBUG_ENABLED', true);

$path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);

if ($path === '/') {
    $path .= 'index.php';
}

if (preg_match('/\.php$/', $path)) {
    require __DIR__.$path;

    return;
}

if (file_exists(__DIR__.$path)) {
    return false;
}

require_once __DIR__.'/index.php';