Creating a ping uptime service with PHP

Question

I have a server that I can use PHP on and a router that can be pinged from the Internet. I want to write a PHP script that sends a ping to the router every 5 minutes with the following results:

If the ping succeeds, then nothing would happen.
If the ping fails, then it waits a few minutes, and if it still fails it sends a warning to my e-mail address once.
After the router is pingable again it sends an e-mail that it's OK.

Could this be done with PHP? How? Does anybody has a small PHP file that does this?

Would not using a cron job sound better? – ajreal Sep 10 '11 at 15:49 — ajreal, Sep 10 '11 at 15:49

score 10 · Accepted Answer · answered Sep 10 '11 at 09:24

Below I've written a simple PHP script that does what you ask. It pings a server, logs the result to a text file ("up" or "down"), and sends an email depending whether the previous result was up or down.

To get it to run every five minutes, you'd need to configure a cron job to call the PHP script every five minutes. (Many shared web hosts allow you to set up cron jobs; consult your hosting provider's documentation to find out how.)

<?php 

//Config information
$email = "your@emailaddress.com";
$server = "google.com"; //the address to test, without the "http://"
$port = "80";


//Create a text file to store the result of the ping for comparison
$db = "pingdata.txt";

if (file_exists($db)):
    $previous_status = file_get_contents($db, true);
else:
    file_put_contents($db, "up");
    $previous_status = "up";
endif;

//Ping the server and check if it's up
$current_status =  ping($server, $port, 10);

//If it's down, log it and/or email the owner
if ($current_status == "down"):

    echo "Server is down! ";
    file_put_contents($db, "down");

    if ($previous_status == "down"):
        mail($email, "Server is down", "Your server is down.");
        echo "Email sent.";     
    endif;  

else:

    echo "Server is up! ";
    file_put_contents($db, "up");

    if ($previous_status == "down"):
        mail($email, "Server is up", "Your server is back up.");
        echo "Email sent.";
    endif;

endif;


function ping($host, $port, $timeout)
{ 
  $tB = microtime(true); 
  $fP = fSockOpen($host, $port, $errno, $errstr, $timeout); 
  if (!$fP) { return "down"; } 
  $tA = microtime(true); 
  return round((($tA - $tB) * 1000), 0)." ms"; 
}

There is no native ping function in PHP, so have a look at http://stackoverflow.com/questions/1239068/ping-site-and-return-result-in-php if you attempting to use this script... or of course use a monitoring system like http://www.nagios.org/ — CodeReaper, Sep 29 '11 at 20:07
by bad, was surfing on my ipad and didn't think to try and scroll down. — CodeReaper, Sep 30 '11 at 08:33

score 3 · Answer 2 · answered Oct 02 '11 at 04:59

3

I personally use the Pingdom service if it can be pinged from the internet and is running an HTTP server on it. No need to really go deep into writing a special script.

answered Oct 02 '11 at 04:59

Rallias

56
1

1

It can be expensive when trying to monitor 50+ websites. – Shir Gans Apr 09 '15 at 02:14

score 0 · Answer 3 · edited May 23 '17 at 11:58

0

well as far as i know you can't create a cronjob with PHP , but what you can do is use crontab

and this so you will be able to ping to required host also you can run instead

exec("ping 1.2.3.4")

in your script

edited May 23 '17 at 11:58

Community

1
1

answered Oct 02 '11 at 07:51

Eli Y

877
16
41

Creating a ping uptime service with PHP

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