试用php的ping命令

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);
?>

 转自http://blog.csdn.net/gumanren/article/details/5752394