php 异步登陆

<?php
// 异步请求函数
function asyncRequest($url, $callback) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 1);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_NOSIGNAL, 1);
    curl_multi_add_handle($mh, $ch);
    do {
        curl_multi_exec($mh, $running);
        curl_multi_select($mh);
    } while ($running > 0);
    curl_multi_remove_handle($mh, $ch);
    curl_multi_close($mh);

    $response = curl_multi_getcontent($ch);
    $info = curl_getinfo($ch);
    curl_close($ch);

    if ($info['http_code'] == 200) {
        $callback($response);
    }
}

// 登录验证回调函数
function loginCallback($response) {
    if ($response == 'success') {
        echo "登录成功";
    } else {
        echo "登录失败";
    }
}

// 异步登录请求
$url = 'http://example.com/login.php?username=user&password=pass';
asyncRequest($url, 'loginCallback');
?>