Beyond built-in rules, Laravel supports custom rule objects (php artisan make:rule) implementing a validate() method for reusable, complex logic. Rules can also be closures inline in a rules array. Form Requests can define withValidator() to add extra validation steps, such as cross-field checks after the standard rules run.
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Validation · medium
30. Form Requests & Custom Validation Rules
Advanced input validation.
Check your understanding
1. What method do modern custom Rule classes implement?
2. Where can you add cross-field validation logic in a Form Request?