# Validation

When referencing validation rules, you must always use the array syntax, rather than pipe-delimited strings.

This ensures consistent formatting whether you have one or many validation rules, if you use the Rule class, or if your validation is complex enough such that you need to create custom validation rules.

// Good
request()->validate([
    'name' => ['required'],
    'email' => ['required', Rule::exists('users')],
]);

// Bad
request()->validate([
    'name' => 'required',
    'email' => ['required', Rule::exists('users')],
]);

# Simple custom validation rules

When declaring simple validation rules, always use snake_case per the Laravel framework convention.

Validator::extend('phone_number', function ($attribute, $value) {
    return PhoneNumber::isValid($value);
});