What does @param mean in a class?

Question

What does the @param mean when creating a class? As far as I understand it is used to tell the script what kind of datatype the variables are and what kind of value a functi

Answer 1

I know this is old but just for reference, the answer to the second part of the question is now, PHP7.

// this function accepts and returns an int
 function age(int $age): int{

  return 18;
}