Mastering Laravel Validation: Advanced Techniques

Introduction
Validation in Laravel isn’t just about checking if a field is required or if it’s a valid email. Laravel offers a wide array of advanced validation techniques that allow you to create highly customized validation logic for your applications. In this comprehensive guide, we’ll explore advanced Laravel validation methods with detailed examples.

1. Validation Groups

Grouping Validation Rules:
You can create validation rule groups to apply multiple rules to a field conditionally

$validator = Validator::make($request->all(), [
    'payment_method' => 'required',
    'credit_card' => [
        'required_if:payment_method,credit',
        'credit_card',
    ],
    'paypal_email' => [
        'required_if:payment_method,paypal',
        'email',
    ],
]);

Conditional Validation Groups:
Use the sometimes method to conditionally apply rules to fields

$validator = Validator::make($request->all(), [
    'is_vip' => 'boolean',
]);

$validator->sometimes('vip_status', 'required', function ($input) {
    return $input->is_vip;
});

2. Rule Objects