ping IP并在mysql DB

Question

我正在尝试编写代码以从表中获取ip并ping并插入ip和响应时间另一个表。 我写的内容如下。它回显ip和响应时间，但只有ips插入到表中。响应时间是空白的。

模式

+-------+-------------+------+-----+---------+--------------‌​--+ 
| Field | Type        | Null | Key | Default | Extra          | 
+-------+-------------+------+-----+---------+--------------‌​--+ 
| id    | int(6)      | NO   | PRI | NULL    | auto_increment | 
| ip    | varchar(30) | NO   |     | NULL    |                | 

+-----------+-------------+------+-----+-------------------+‌​-------+ 
| Field     | Type        | Null | Key | Default           | Extra | 
+-----------+-------------+------+-----+-------------------+‌​-------+ 
| Log_time  | timestamp   | NO   |     | CURRENT_TIMESTAMP |       | 
| ip        | varchar(30) | NO   |     | NULL              |       | 
| Ping_time | varchar(30) | YES  |     | NULL              |       | 

代码

<?php
 // Connects to your Database

mysql_connect("localhost","xxx","xxx");
//database connection
mysql_select_db("xxxxx") or die(mysql_error()); 

$sql="select * from iplist where id=(SELECT MAX(id) FROM iplist)";
$data = mysql_query($sql)  or die(mysql_error()); 
//asing ip to variables 

$row = mysql_fetch_assoc($data);
$id=$row["id"];
$id1=$id;
while($id1>0) {
    $sql="select ip from iplist where id=($id1)";
    $data = mysql_query($sql)  or die(mysql_error()); 
    $row = mysql_fetch_assoc($data);
    $ip=$row["ip"];

    //ping ips
    $ip_ad=$ip;
    $ping = system("ping -c 1 $ip_ad  | head -n 2 | tail -n 1 | awk '{print $7}'", $ping_time);
    print $ping_time[0]; // First item in array, since exec returns an array.
    $responcetime = $ping_time[0];
    $dilay=$responcetime;
    echo $ip;
    echo $dilay;
    //send data to database
    //inserting data order
    $order = "INSERT INTO Ping_log (ip, Ping_time) VALUES ('$ip','$dilay')";
    //declare in the order variable
    $result = mysql_query($order);  //order executes
    $id1 --;
}
?>