hehe.org/vendor/symfony/polyfill-php73/bootstrap.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

use Symfony\Polyfill\Php73 as p;

if (PHP_VERSION_ID < 70300) {
    if (!function_exists('is_countable')) {
        function is_countable($var) { return is_array($var) || $var instanceof Countable || $var instanceof ResourceBundle || $var instanceof SimpleXmlElement; }
    }

    if (!function_exists('hrtime')) {
        require_once __DIR__.'/Php73.php';
        p\Php73::$startAt = (int) microtime(true);
        function hrtime($asNum = false) { return p\Php73::hrtime($asNum); }
    }

    if (!function_exists('array_key_first')) {
        function array_key_first(array $array) { foreach ($array as $key => $value) { return $key; } }
    }

    if (!function_exists('array_key_last')) {
        function array_key_last(array $array) { end($array); return key($array); }
    }
}