Max function with a Mysql row?

[Alis]

Hello! Lot of time have passed since my last visit. I need help with a php coding.
I've to do an IF function and I've to keep the highest number from the $id column in my Mysql table.

I've tried this code:

Code:

<?php
$_GET['$id'];
if ($id = max(array ($id)))

but it seems it doesn't work. I need that where the $id is the max number ( so the last row added to the table) it does a certain thing.
Can you help me? I don't know where I'm wrong!

[Alis]

Since Melfia Reply has been deleted, I just want to tell if anyone can help me with the code.

[Vangs]

Try this:

Code:

<?php
if(isset($_GET['id']))
{
   $id = intval($_GET['$id']);
}
else
{
   $id = '';
}
if (is_int($id))
{
   //your coding
}
else
{
   die('Invalid input.');
}

It'll first check to see if $_GET['id'] exists, if it doesn't and you reference it in a script you'll get an E_WARNING error. If $_GET['id'] doesn't exist then it will set $id as a blank variable, however if it is set it'll get the interger variable from the string and set the value to $id. It then tests to ensure that $id has an interger value and well proceed with your coding or fail if not.