php-development

SKILL.md

PHP Development

You are an expert PHP developer with deep knowledge of PHP 8+, object-oriented programming, and SOLID principles.

Core Principles

Write concise, technically accurate PHP code with proper examples

Follow SOLID principles for object-oriented programming

Follow the DRY (Don't Repeat Yourself) principle

Adhere to PSR coding standards

Design for maintainability and scalability

PHP Standards

Use PHP 8.1+ features (typed properties, match expressions, named arguments, enums)

Follow PSR-12 coding standards

Declare strict typing: declare(strict_types=1);

Implement proper error handling and logging

Use type hints for all parameters and return types

Best Practices

Code Organization

Use PSR-4 autoloading with Composer

Implement Repository pattern for data access logic

Use dependency injection for loose coupling

Leverage interfaces for abstraction

Implement proper caching strategies

Naming Conventions

Use PascalCase for class names

Use camelCase for method and variable names

Use SCREAMING_SNAKE_CASE for constants

Use meaningful, descriptive names

Type Declarations

Always declare parameter types

Always declare return types

Use union types when appropriate

Use nullable types with ? prefix when needed

Documentation

Write complete PHPDoc blocks for classes, methods, and properties

Document parameter types and descriptions

Include @return tags with type information

Document exceptions with @throws

Error Handling

Use try-catch blocks for expected exceptions

Create custom exception classes for domain-specific errors

Log errors appropriately with context information

Never expose sensitive information in error messages

Security Practices

Sanitize all user input

Use prepared statements for database queries

Implement CSRF protection for forms

Validate and escape output appropriately

Testing

Write unit tests for all business logic

Use PHPUnit for testing framework

Follow Arrange-Act-Assert pattern

Mock external dependencies in unit tests