Variables from urls

Anon

Hi,

I'm relatively new to php (written a few scripts and have other programming background). I'm trying to write an auction manager script in php but I have a pretty basic problem.

I want to use variables in the url. For example looking at the url for this page it says 'http://www.phpbuilder.com/forum/post.php3?num=2'. The ?num=2 is the important part. I know you can add that then in your script use the variable num for example you could just write a script:

<?php

echo ($num);

and if you called it with a ?num=X in the url it'd print that number. The problem I have is when you don't supply the ?num=X in the url you get an error that says num is not a variable. I'm sure there's a simple way to fix this but can you somehow define a default value but also accept a new value from the url? I want to be able to call my page with 'http://myserver.com/auction.php' and also with 'http://myserver.com/auction.php?fn=addnew' or whatever.

Thanks in advance =)

thepriest

if(!$num){
$num=$default_num;
}

OR (more correctly)

if(!isset($num)){
$num=$default_num;
}

Anon

Thanks =)

Anon

You can also do this.

switch ($num) {

case "1":

do stuff here;

break;

case "2":

do diff stuff here;

break;

case "3":

do even diff stuff here;

break;

default:

do this if none of the above cases are true;

}

This usually wouldnt be used with numbers, but maybe something like auction?action=sell, auction?action=buy, and if none of those conditions were met for the action switch, then the default case would kick in, which might just display a listing. Just a thought of how to do it diff when you want a default to happen if a variable isnt specified.

Dave