Does it generate unit tests?

Yes, it automatically generates a PHPUnit test file to ensure the Null Object correctly returns neutral values and respects the defined interface.

How does this benefit my codebase?

It implements the Null Object pattern which allows you to treat 'nothing' as a first-class object, removing 'if ($object !== null)' checks and making your code more polymorphic.

What version of PHP does this skill support?

The skill is specifically optimized for PHP 8.4, utilizing modern features like readonly classes, strict typing, and constructor property promotion.

Is this compatible with Domain-Driven Design (DDD)?

Absolutely. It follows DDD naming conventions and places files in the appropriate Bounded Context directories by default.

What are neutral return values?

Neutral values are safe defaults like empty strings, zeros, or empty arrays that allow the calling code to continue execution without encountering errors when a real implementation is missing.

PHP Null Object Pattern Generator

Name: PHP Null Object Pattern Generator
Author: dykyi-roman

bydykyi-roman

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API Development

Generates production-grade Null Object pattern implementations for PHP 8.4 to eliminate repetitive null checks and improve code safety.

This skill automates the creation of the Null Object design pattern within PHP applications, specifically tailored for Domain-Driven Design (DDD) and Clean Architecture contexts. It generates a unified interface with an isNull() method, a safe 'no-op' null implementation with appropriate neutral return values, a real implementation scaffold, and corresponding unit tests. By replacing null return values with polymorphic objects, it helps developers write cleaner, more robust code that strictly follows the Liskov Substitution Principle and eliminates defensive programming boilerplate.

Key Features

01Smart neutral return value mapping for all standard PHP types

02DDD-compliant directory structure and naming convention enforcement

03Automated generation of PHP 8.4 interfaces and implementations

04Automated PHPUnit test generation for the Null implementation

05Standardized isNull() method implementation for explicit state checking

0645 GitHub stars

Use Cases

01Handling missing domain entities in repositories to avoid null pointer exceptions

02Implementing safe default behaviors for feature toggles and optional modules

03Replacing null checks for optional dependencies like Loggers, Notifiers, or Cachers

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add dykyi-roman/awesome-claude-code create-null-object

For use in Claude.ai and ChatGPT

Download Skill