php檢測服務器是否可用 不可用發動釘釘消息

<?php
set_time_limit(0);
//ping一個IP地址，能不能通
function ping($ip)
{
    $ip_port = explode(':', $ip);
    // var_dump($ip_port);
    if (filter_var($ip_port[0], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {        //IPv6
        $socket = socket_create(AF_INET6, SOCK_STREAM, SOL_TCP);
    } elseif (filter_var($ip_port[0], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {    //IPv4
        $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
    } else {
        return false;
    }

    if (!isset($ip_port[1])) {        //沒有寫端口則指定爲80
        $ip_port[1] = '80';
    }
    //var_dump($socket);
    @$ok = socket_connect($socket, $ip_port[0], $ip_port[1]);
    //var_dump(socket_strerror(socket_last_error($socket)));
    //var_dump($ok);
    socket_close($socket);

    if ($ok) {
        //echo "鏈接OK\n";
        return true;
    } else {
        //echo "socket_connect() failed.\nReason: ($ok) " . socket_strerror($ok) . "\n";
        return false;
    }
}

function sendMessage($data){
    $postUrl = 'http://*****.shtml';//釘釘接口地址
    $postData = $data;
    //$postData = http_build_query($postData);
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $postUrl);
    curl_setopt($curl, CURLOPT_USERAGENT,'Opera/9.80 (Windows NT 6.2; Win64; x64) Presto/2.12.388 Version/12.15');
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // stop verifying certificate
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_POST, true);
    //curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
    curl_setopt($curl, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/json',
        'Content-Length: ' . strlen($postData)
    ));
    curl_setopt($curl, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
    $r = curl_exec($curl);
    curl_close($curl);
    return $r;
}

$ipList=array('192.168.2.50');//被監測ip列表
$mobileList=array('1380000000','1381111111');//異常通知釘釘手機號碼
$sendData['mobiles']=$mobileList;
$sendData['type']=1;

foreach($ipList as $k=>$v){
    if(!ping($v)){
        $sendData['content']="親，IP爲".$v."的服務器宕機了，快去查看一下吧 ".date('Y-m-d H:i:s');
        sendMessage(json_encode($sendData));
    }
}