Part #1: Closure-based Custom Laravel Validation

While I was working with Laravel, validation using closure came to my mind, and I know it will be helpful to you. This tutorial assists you with all what is the difference between closure-based validation and other validation methods. So, this article shows you how to use Laravel validating from request using closures.

If you only need the functionality of a custom validation rule once throughout your application, you may use a Closure instead of a rule object. The Closure receives the attribute's name, the attribute's value, and a $fail callback that should be called if validation fails. Below is the code example:

$request->validate([
    'new_password' => ['required', 'min:8', 'confirmed'],
    'new_password_confirmation' => ['required'],
    'current_password' => [
        'required',

        // closure-based Validation
        function ($attribute, $value, $fail) use ($user) {
            if (! Hash::check($value, $user->password)) {
                $fail("Invalid current password.");
            }
        }
    ]
]);