<?php
function _is_mobile_device($ua) {
    // 常见移动设备关键词（不区分大小写）
    $mobile_keywords = [
        'Mobile', 'Android', 'iPhone', 'iPad', 'iPod',
        'BlackBerry', 'Windows Phone', 'Opera Mini', 'IEMobile',
        'webOS', 'Symbian', 'Samsung', 'HTC', 'LG', 'Nokia',
        'HarmonyOS', 'HongMeng'
    ];

    foreach ($mobile_keywords as $keyword) {
        if (stripos($ua, $keyword) !== false) {
            return true;
        }
    }
    return false;
}

function _to_load($page)
{
	$url = $page;
	if($url == '404' || $url == '403' || $url == '500')
	{
		http_response_code($url);
		return;
	}

	echo file_get_contents($_SERVER['DOCUMENT_ROOT'] . $page);
}

$ua = $_SERVER["HTTP_USER_AGENT"] ?? '';
$ismob = _is_mobile_device($ua);

if($ismob) _to_load('/jump.html');
else _to_load('404');
?>