Create a uptime checking system for your site/host/ect

This is a pretty basic uptime checker I just put together. You will need: database, knowledge of programming(not lots of knowledge) for this I created a api.php file so you can use it as a api, call the check.

API.PHP code:
<?php mysql_connect('host', 'username', 'password') or die(mysql_error()); mysql_select_db('database'); $query = mysql_query('SELECT * FROM checks WHEREip="'.$_GET['ip'].'" ANDowner`="'.$_GET['owner'].'"');

  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"; 
  }`

 ` while($row = mysql_fetch_assoc($query))
  {
    $em = $row['notification_email'];

    $server = $row['ip'];
    $port = $row['port'];
    $last_status = $row['status'];
    //if($last_status=='ON') { echo 'Last checked: <font color="green">Online</font>'; } else { echo 'Last checked: <font color="red">Offline</font>'; }

    $curr_status = ping($server,$port,10); // server ip: $server, server port: $port, how long till timeout: 10 (you can change it)

    if($curr_status == "down")
    {
        echo "<font color='red'>Offline</font>"; // offline? oh noes
        mysql_query("UPDATE  `checks` SET  `status` =  'OFF' WHERE  `checks`.`id` =".$row['id'].";");
    }
    else
    {
        echo "<font color='green'>Online</font>"; // online? oh yeah :D
        mysql_query("UPDATE  `checks` SET  `status` =  'ON' WHERE  `checks`.`id` =".$row['id'].";");
    }
  }

//mail($em, "Notification from System", "Your server/website/ect looks like its {$curr_status}"); optional

?>`

now what this does is, first of all you would visit myurl/api.php?ip=ip&owner=admin(or whatever username you set in database) then it would check the result, now for database, you need to create a table called checks, structure it like this(id = auto insert):
img src="http://puu.sh/1BaIg" alt="img-01-tutorial" />

For some sample content I just put:
img src="http://puu.sh/1BaIU" alt="img-02-tutorial" />

Now, if I were to visit: myurl/api.php?ip=127.0.0.1&owner=admin it would ping using the ping function as in the code, now you have a option to email the statuses to the client/yourself/ect.

For every IP you want to check you need to add it into database, then I'd suggest making a CRON job to check statuses every * minutes(ex: 30 minutes or 1 hour) and do the api call for the users service/website/ect.

Thus being able to have a very basic checking system, not the best I know but its a good start for some people who want to make their own.

I hope you liked this guide, have fun.