curl和ping-如何检查网站是打开还是关闭？

这样的事情应该工作

    $url = 'yoururl';    $ch = curl_init($url);    curl_setopt($ch, CURLOPT_NOBODY, true);    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);    curl_exec($ch);    $retpre = curl_getinfo($ch, CURLINFO_HTTP_CODE);    curl_close($ch);    if (200==$retpre) {        // All's well    } else {        // not so much    }