we have already explained how you can get age from provide date now will focus more on how to validate date of birth today

now this function is basically validate date and finds the age from date_diff function in php

We are going to use the function we applied in date validation in How to do date validation in php (special function)

then we apply a little tweak to get what we want
this function makes sure that the date parameters are integers

let's apply this in our work

you can echo this function since it just integer that is expected from it

we can still program a logic to check if it empty or not