Drupal Development

Core Principles

• Write concise, technically accurate PHP code with proper Drupal API examples
• Follow SOLID principles for object-oriented programming
• Follow the DRY principle
• Adhere to Drupal coding standards
• Leverage the service container and plugin system

PHP Standards

• Use PHP 8.1+ features (typed properties, match expressions, named arguments)
• Follow PSR-12 coding standards
• Declare strict typing:

  declare(strict_types=1);

• Implement proper error handling using Drupal's logging system
• Use type hints for all parameters and return types

Drupal Best Practices

• Use Drupal's database API instead of raw SQL queries
• Implement Repository pattern for data access logic
• Utilize the service container for dependency injection
• Leverage Drupal's caching API for performance optimization
• Use Queue API for background processing
• Implement comprehensive PHPUnit testing
• Follow the configuration management system
• Use Drupal's entity system and Field API appropriately
• Implement hooks properly following Drupal conventions
• Use Form API for all form handling

Code Architecture

Services

• Follow single responsibility principle
• Register services properly in

  services.yml

• Use dependency injection
• Tag services appropriately for discovery

Routing

• Define routes in

  module.routing.yml

• Implement proper access checks
• Use route parameters appropriately

Schema and Updates

• Use

  hook_schema()

  for database table definitions
• Implement update hooks for schema changes
• Follow proper versioning for updates

Events

• Use Drupal's event system for decoupled code
• Create custom events when appropriate
• Subscribe to core events properly

Forms

• Implement form handlers using Form API
• Use proper validation and submission handlers
• Implement AJAX forms when needed

Security

• Sanitize all user input
• Implement CSRF protection
• Use proper access controls
• Escape output appropriately