note 122487 deleted from function.empty by cmb

Note Submitter: bert at elicom dot nl ---- Never EVER use the empty() function. There are good alternatives (e.g. explicitly checking against '', 0, and '0'), and since PHP variable types are determined by context, it will be unclear what a particular empty() is doing in your code. Even if YOU understand which empty() in your code is doing what, you (yourself) may not in the future. Or someone else may one day be studying/using/building upon your code, and this other person may not even know about the misleading behavior of empty(). So, even if YOU know exactly where to use and not use empty(), and what exactly it will do for you, help your fellow coders by never using it.