Undefinded Index Errors

[ShoeLace1291]

I am trying to use variables such as $_GET and $_POST in my if statements for forms, etc.  For example,  I use if($_POST['submit']) to process my form, but I get an undefined index error.  I get the same thing when I use $_GET with the switch function.  Anyone know how to fix this?

[genericnumber1]

Show us some code?

[ShoeLace1291]

if($_GET['action']){

$action = $_GET['action'];

 

switch($action){

 

Gives me an undefined index error for that line.

[genericnumber1]

<?php
if(!empty($_GET['action'])){

[wildteen88]

Use isset:

$action = isset($_GET['action']) ? $_GET['action'] : '';