How to make a validation on a calculated field in laravel 5.5

Question

I want to know how to validate the calculated value of a input field .

For example I have a field named birthDate I want to accept the date only if the calculated age from birthDate is less than 16 .

I want to make the validation within a custom Request class

Thank you.

Answer 1

Validator::extend('youngerThan', function($attribute, $value, $parameters)
{
    $maxAge = ( ! empty($parameters)) ? (int) $parameters[0] : 16;

    //return (new DateTime)->diff(new DateTime($value))->y <= $minAge;



    // or the same using Carbon

    $dob = new Carbon\Carbon($value);

    return $dob->age >= $minAge;
});

This way you can use the rule for any age you like:

$rules = ['dob' => 'youngerThan']; 
$rules = ['dob' => 'youngerThan:15'];