undefined index [closed]

Answer 1

I would wrap the php-block at the top in an if:

if( isset($_POST['submit']) ){ 

    // Rest of the code that populates the variables and so on

}

This would ensure that you don't try to operate on values that aren't even remotely there. :)

Answer 2

Well it looks like the $_POST superglobal isn't populated (have you checked this?) or, at least, it doesn't contain what you think it does.

Your code seems to be assuming the POST values without checking.

Run print_r($_POST) - does it contain the right data?