php通过类方法实现ping功能

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//通过在URL中输入域名,ping的次数例如 ：http://localhost:8080/demo2/ping.php?domain=www.google.com&num=3

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>php实现ping功能</title></head><body><?phpclass CNetPing{    public  $icmp_socket;    public $request;   // public $request_len;   // var $reply;    public $errstr;  //  public $time;  //建立连接到发送包得到响应的时间    public $timer_start_time; //开始发送请求包的时间    public $lost_package=0;//默认丢失的包的数量为0    public $recv_package=0;//默认接受到的包的数量为0    public $times=array();    function CNetPing()    {        $this->icmp_socket = socket_create(AF_INET, SOCK_RAW, 1);        //echo "  $this->icmp_socket";        socket_set_block($this->icmp_socket);    }//如果调用时不带可选参数，本函数以 "msec sec" 的格式返回一个字符串，其中 sec 是自 Unix 纪元（0:00:00 January 1, 1970 GMT）起到现在的秒数，msec 是微秒部分。//字符串的两部分都是以秒为单位返回的    function start_time()    {        $this->timer_start_time = microtime();//microtime() 函数返回当前 Unix 时间戳和微秒数。        //echo "$this->timer_start_time";    }    function get_time($percision = 2)    {        // format start time        list($start_usec, $start_sec) = explode(" ", $this->timer_start_time);//explode() 函数把字符串分割为数组        $start_time = ((float)$start_usec + (float)$start_sec);        // get and format end time        list($end_usec, $end_sec) = explode(" ", microtime());        $end_time = ((float)$end_usec + (float)$end_sec);        $total_time = $end_time - $start_time;        return number_format(1000*$total_time, $percision);    }    /**     * @param $dst_addr     * @param int $timeout     * @param int $percision     * @return bool|string     */    function ping($dst_addr,$num, $timeout = 5, $percision = 3)    {        // lets catch dumb people        if ((int)$timeout <= 0) $timeout = 5;        if ((int)$percision <= 0) $percision = 3;        /* create the socket, the last '1' denotes ICMP */       // $socket = socket_create(AF_INET, SOCK_RAW, 1);        /* set socket receive timeout to 1 second */        //socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => $timeout, "usec" => 0));        for($i=0;$i<$num;$i++) {            socket_set_option($this->icmp_socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => $timeout, "usec" => 0));            /* connect to socket */            if (socket_connect($this->icmp_socket, $dst_addr, null)) {                echo "socket_connect连接 $dst_addr.成功<br>";            } else {                $this->errstr = "Cannot connect to $dst_addr";                return FALSE;            }            /* 创建一个发送包*/            $this->request = "\x08\x00\x19\x2f\x00\x00\x00\x00\x70\x69\x6e\x67";            /* record start time */            $this->start_time();            socket_send($this->icmp_socket, $this->request, strlen($this->request), 0);            //socket_send($this->icmp_socket,$package,strlen($package),0);            if (@socket_read($this->icmp_socket, 255)) {                //$this->time = $this->get_time($percision);               $this->times[$i]=$this->get_time($percision);                $this->recv_package++;                //return $this->time;            } else {                $this->lost_package++;                $this->errstr = "Timed out";            }            socket_close(icmp_socket);        }    }}    $domain=$_GET['domain'];    $num=$_GET['num'];    echo "域名：".$domain."<br>";    echo "次数：".$num."<br>";    $percision=3;    $address = gethostbyname($domain);    $ping=new CNetPing();    $ping->ping($address, $num, $percision);    echo"已接受的数据包个数为：$ping->recv_package<br>";    echo"丢失的数据包个数为：$ping->lost_package<br>";    if($ping->recv_package==0){        echo "$ping->errstr";    }else{        sort($ping->times);//系统排序函数。升序函数（从小到大排序）        echo "最短时间为:".$ping->times[0]."ms      最长时间为：".$ping->times[$num-1]."ms  平均时间为："            .number_format((array_sum($ping->times)/$num),$percision)."ms<br>";//array_sum()计算数组中所有值的和    }?></body></html>

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