PHP环境下进行Ping测试

class Ping
{
    public function pings($ip, $times = 4)
    {
        $info = array();
        if (!is_numeric($times) ||  $times - 4 < 0) {
            $times = 4;
        }
        exec("ping $ip -c $times", $info);
        if (count($info) < 9) {
            $info['error'] = 'timeout';
        }
        return $info;
    }
    /**
     * @param Json信息输出
     * @arr:需要转换的数组
     */
    public function json($arr = array(), $code = JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES)
    {
        header("Content-Type:text/json");
        exit(json_encode($arr, $code));
    }
}
$a = new Ping();
$ip = '183.220.151.32';
//var_dump($a->pings($ip));
echo $a->json($a->pings($ip));