title Data Validation - Symfony Certification Preparation List ✅ Back to index Data Validation Validation - symfony.com ✅ PHP object validation The Basics of Validation - symfony.com ✅ Built-in validation constraints Supported Constraints - symfony.com ✅ Validation scopes Constraint Targets - symfony.com ✅ Validation groups How to Apply only a Subset of all Your Validation Constraints (Validation Groups) - symfony.com ✅ Group sequence How to Sequentially Apply Validation Groups - symfony.com ✅ Custom callback validators Callback Constraint - symfony.com ✅ Violations builder Custom Validation Constraint - symfony.com ✅