# RL MailWarmer WordPress Plugin Guide

## Build/Test Commands
- **Run PHPUnit Tests**: `vendor/bin/phpunit tests`
- **Run Single Test**: `vendor/bin/phpunit tests/TestName.php`
- **Composer Update**: `composer update`
- **Composer Install**: `composer install`

## Code Style Guidelines
- **Class Naming**: Use `RL_MailWarmer_ClassName` format with underscores
- **Method Naming**: Use snake_case for method names
- **File Naming**: Use `class-rl-mailwarmer-name.php` for class files
- **Database**: Use `rl_mailwarmer_` prefix for all tables
- **Error Handling**: Use WP_Error for WordPress-specific errors, Exceptions for PHP-level errors
- **Validation**: Always validate and sanitize inputs using WordPress functions
- **Documentation**: Use PHPDoc blocks for classes and methods
- **Security**: Follow WordPress security best practices (prepare SQL, validate nonces)
- **Imports**: Place includes at the top, use require_once for class dependencies
- **Type Hints**: Use PHP type hints for method parameters and return types