I'm relatively new to PHP and I'm currently working on a project where I need to handle type checking or type validation using an enumeration. I understand that PHP allows us to define an enumeration using the "SplEnum" class, but I'm not entirely sure how to use it for type validation.
Specifically, I have a scenario where I want to restrict a variable's value to a specific set of options, similar to an enum in other programming languages. For example, let's say I have a variable called $gender and I want to ensure that it can only have values of either "Male" or "Female".
I've done some research and it seems like using an enumeration is a viable solution. However, I'm struggling to understand how to implement it properly. I want to be able to use the enumeration to validate the value of $gender and display an error if an invalid value is assigned.
Could someone please guide me through the process of setting up an enumeration in PHP for type checking or validation? I would greatly appreciate any code examples or step-by-step explanations you could provide.