I have a question regarding PHP and form validation. Currently, I'm working on a project where I need to make sure that the user input matches certain predefined values. To achieve this, I was wondering if it's possible to use an enumeration to define the allowed values for user input or form validation in PHP?
I have a form where users need to select their country of residence, and I want to ensure that they can only choose from a predefined list of countries. Instead of manually checking if the user input matches one of the allowed options, it would be great if I could somehow define this list or enumeration and let PHP handle the validation.
I've heard about enumerations being used in other programming languages to define a set of valid values. However, I'm not sure if PHP has a similar feature or if there's an alternative approach I can take.
Any guidance or suggestions on how to achieve this in PHP would be greatly appreciated! Thank you in advance.