Question

So I am fairly new to php, but before I really had a solid understanding I picked up this habit. When checking for whether or not a $_SESSION / $_POST / $_GET variable was set I use this:

if($_SESSION['username'] != '' {
 //allow access
 header('Location: welcomefriend.php')
}
else {
 //get out
 header('Location: getoutofhereyournotwelcome.php')
}

I have used this in login scripts for checking if the session is set to allow access, etc. So now I know about isset / empty but I always seem to run into problems with those.

So my question is will I ever encounter a problem when using if($some_far != '') to check if a variable is set?

Answer 1

That would show notice if the variable doesnot exist, so do:

if( !empty($_SESSION["username"]) ) {
...