执行命令在Linux Centos上不起作用

Question

Good day,

I am working on a system which checks whether a certain IP address is up or down. I have a MySQL DB with a table containing a list of IP addresses.I have created the following function to ping the IP address:

function pingAddress($ip) {

        $result = exec('ping $ip -i 15 ', $outcome, $status);

        if (0 == $status) {
            echo 'Server UP ';
        } else {
            echo 'Server down ';
        }
}

and in my while loop I have the following:

while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)){
   ?>
   <tr>
       <td><?php pingAddress($row['client_ip_address']); ?></td>
   </tr>

   <?php
   } //end while
  ?>

However instead of getting 0 (because servers are up) I always get 2.

I have replaced the line $result = exec('ping $ip -i 15 ', $outcome, $status); with $pingresult = system("ping -n 3 $ip 2>&1", $outcome, $status); OR $pingresult = shell_exec('/bin/ping -qc 1 '.$ip.' | awk -F/ \\'/^rtt/\\'', $result); OR ('ping $ip -i 15 ', $outcome, $status); $pingresult = shell_exec('/bin/ping -qc 1 '.$ip.' | awk -F/ \\'/^rtt/\\'', $result); OR ('ping $ip -i 15 ', $outcome, $status); Still the result didn't change. Either I got an empty array (when I do var_dump($status) or var_dump($outcome) ).

I am using Centos7 with apache installed on it.

I am a missing something because I have tried virtually the majority of solutions suggested here based on previous similar questions but it didn't work.

Is there a much better way code such a system?

Thanks for your assistance.

Answer 1

You likely need to modify the syntax of exec :

$result = exec('ping -i 15 -c 3 ' . $ip, $outcome, $status);

Also, you might include -c or whatever your ping count option is... otherwise it will run forever.