Notice: Undefined index

[mcrackin]

I'm using this tutorial to make a login system for my website.

 

I'm running the page on my localhost but I'm getting errors all over demo.php that say Notice: Undefined index: msg at .....

 

 

What does Undefined index mean and how do I fix this?

 

Matt

[AbraCadaver]

You're trying to use an array with that index and it doesn't exist, maybe $_POST['msg'] or something similar?

[Psycho]

You are getting that error because your error reporting is set to a high threshold, which it should be for developing purposes. But, they would be lower in production.

 

When you try to reference a variable that doesn't exist - it is an undefined variable or, in this case, you may be referencing the index of an array where the array exists but the index does not. For example:

if($_SESSION['msg']['reg-err'])

 

If that session value has not been set that if() statement would generate that error. TI don't know what the intent was for that condition. If the intent was to check if the variable was set, then you should use

if(isset($_SESSION['msg']['reg-err']))

 

But if the intent was to check if the value was not false, then you should first check if the variable is set, then check if it is not false.

if(isset($_SESSION['msg']['reg-err']) and $_SESSION['msg']['reg-err'] != false)

 

In a production environment set to a lower error reporting threshold, that code would probably work just fine, but it is poor coding practice. But, looking at that tutorial, I would suggest finding a better one.

[mcrackin]

I've got rid of the errors and everything is working fine now except the mailing of my password part.

[0xMatt]

If you post what's going on then we'll be glad to help.

 

Have you checked your mail logs for errors? If you are on linux it should be in /var/log/messages or /var/log/maillog. Not sure about windows though.

 

If it's a PHP error go ahead and post that. If you think the script is being executed but mail is just not being sent without an error make sure the mail function is indeed being executed and check the logs for errors.