Notice: Undefined variable error

[Lauj]

The PHP pages used to work under PHP 4.0.6 but now that we moved to PHP version 5.0.3, I'm getting the error "Notice: Undefined variable" on almost all of my PHP pages. Will anyone tell me what might be the problem here?

ljCharlie

[LordShryku]

Well, it's one of two reasons:

1) You're not using isset or empty to check vars. Meaning that you are either assuming they are present, and they aren't, or you're doing your checking like if($var) instead of if(isset($var)) or if(empty($var)).

2) You had register_globals on, and in the new installation, do not. So any global variables should be accessed through their corresponding array.

[Lauj]

Many thanks for your help. What if I have something like this $POST["sltScholarship"]. How do I check if it is empty or set? Do I just do if(isset($POST["sltScholarship"]) or something diferent?

ljCharlie

[LordShryku]

Depending what you want to do. A variable can be set, but empty at the same time. If a variable is blank(''), zero, or false, it is set, but empty. If you just want to make sure it exists, use isset. If you want to make sure it exists and has a value that's not empty, use empty.