Where should I check the type of a variable using PHP 7?

Question

With version 7, PHP introduced scalar types, types with null values, and return types. Using these functions is immediately useful (self-executing code, fatal errors at runtime, the list goes on), but I'm not sure at what point in my code I should start using them. I believe the answer should be "as soon as possible."

Prior to PHP 7, a lot of my code looks like an example class. My controller initializes the class and passes POST variables to it. Then I will pass the type variable in the class to make sure that all the vars are correct.

class User {
     public function createUser($username, $password, $some_float)
     {
          // Check types, validate vars and create user
     }
}

With PHP 7 I can do it

class User {
     public function createUser(string $username, string $password, float $some_float)
     {
          // Validate vars and create user
     }
}

, User . .

Answer 1

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