使用PHP自动PING IP

mm111222

　　使用PHP自动PING IP，校检网络连接是否正常！
　　<?php    $server = 'ping kalvin.cn -n 1';    $last_line = exec($server, $arr);    echo "$last_line"; //最后总结结果    print_r($arr); //PING命令详细数据数组    ?>
　　国外一位大师使用Sockets Ping，似乎效率更高：
PHP代码

　　<?php    // Checksum calculation function    function icmpChecksum($data)    {    if (strlen($data)%2)    $data .= "/x00";    $bit = unpack('n*', $data);    $sum = array_sum($bit);    while ($sum >> 16)    $sum = ($sum >> 16) + ($sum & 0xffff);    return pack('n*', ~$sum);    }    // Making the package    $type= "/x08";    $code= "/x00";    $checksum= "/x00/x00";    $identifier = "/x00/x00";    $seqNumber = "/x00/x00";    $data= "Scarface";    $package = $type.$code.$checksum.$identifier.$seqNumber.$data;    $checksum = icmpChecksum($package); // Calculate the checksum    $package = $type.$code.$checksum.$identifier.$seqNumber.$data;    // And off to the sockets    $socket = socket_create(AF_INET, SOCK_RAW, 1);    socket_connect($socket, "www.google.com", null);    // If you're using below PHP 5, see the manual for the microtime_float    // function. Instead of just using the m    //     icrotime() function.    $startTime = microtime(true);    socket_send($socket, $package, strLen($package), 0);    if (socket_read($socket, 255)) {    echo round(microtime(true) - $startTime, 4) .' seconds';    }    socket_close($socket);    ?>