In where shall I use isset() and !empty()
isset, php
Solution
isset() checks if a variable has a value, including `False`, `0` or empty string, but not including NULL. Returns TRUE if var exists and is not NULL; FALSE otherwise.
empty() does a reverse to what `isset` does (i.e. `!isset()`) and an additional check, as to whether a value is "empty" which includes an empty string, 0, NULL, false, or empty array or object False. Returns FALSE if var is set and has a non-empty and non-zero value. TRUE otherwise
Problem
I read somewhere that the `isset()` function treats an empty string as `TRUE`, therefore `isset()` is not an effective way to validate text inputs and text boxes from a HTML form. So you can use `empty()` to check that a user typed something. Is it true that the `isset()` function treats an empty string as `TRUE`? Then in which situations should I use `isset()`? Should I always use `!empty()` to check if there is something? For example instead of ``` if(isset($_GET['gender']))... ``` Using this ``` if(!empty($_GET['gender']))... ```