MCPInstall

php-modernization

Use when modernizing PHP code: PHP 8.1-8.5 features, PSR/PHP-FIG/PER-CS compliance, PHPStan/Rector/PHP-CS-Fixer/PHPat tooling, DTOs/enums/readonly/property hooks, type safety. Triggers: PHP modernization, type safety, PHPStan, Rector, PHP-CS-Fixer, enum, DTO, readonly, stricttypes, property hooks, PHP 8.4, PHP 8.5.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/netresearch/php-modernization-skill --skill php-modernization
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads php-modernization automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

PHP Modernization

Agent contract

  1. Discover: uv run ${CLAUDE_SKILL_DIR}/scripts/introspect.py (cheap), or verify_php_project.py --summary (full, with agent_actions[]).
  2. Drill: ... --check PM-XX per finding. Full output when triaging >3.
  3. Apply: uv run ${CLAUDE_SKILL_DIR}/scripts/modernize_loop.py --mode dry-run. Review transcript before applying.
  4. References: load on demand; do not pre-load.

Reference routing

NeedRead
PHP 8.0-8.3 baselinereferences/php8-features.md
PHP 8.4references/php-8.4.md
PHP 8.5references/php-8.5.md
PSR / PER-CSreferences/psr-per-compliance.md
PHPStan configreferences/phpstan-compliance.md
Static analysisreferences/static-analysis-tools.md
PHP-CS-Fixer deprecationsreferences/php-cs-fixer-deprecations.md
DTOs / VOs / inputsreferences/type-safety.md, references/request-dtos.md
Adapter / registryreferences/adapter-registry-pattern.md
Multi-version compatreferences/multi-version-adapters.md, references/composer-package-metadata.md
Symfony patternsreferences/symfony-patterns.md
PSR-15 middlewarereferences/psr15-middleware-architecture.md
Doctrine edgesreferences/doctrine-modernization-edges.md
API Platformreferences/api-platform-edges.md
Immutabilityreferences/immutability-boundaries.md
Contracts & invariantsreferences/contracts-and-invariants.md
Mutation testingreferences/mutation-testing.md
Lexing PHP as tokens, across versionsreferences/lexing-php-across-versions.md
Migration planningreferences/migration-strategies.md
Public API inventory vs consumersreferences/public-api-inventory.md
PHPUnit 12→13, mock vs stubreferences/phpunit-modernization.md
Multi-agent dispatch hazardsreferences/multi-agent-pitfalls.md
Reading a PHP config file without running itreferences/reading-php-config-safely.md

Hard guardrails

  • Never apply readonly to Doctrine entities or mapped-superclasses (embeddables: see references/doctrine-modernization-edges.md).
  • Never run Rector without --dry-run. Invoke vendor/bin/rector directly — composer script aliases can drop ---forwarded flags depending on configuration.
  • Never raise PHPStan level without regenerating + committing the baseline. Shrink, never delete.
  • Never apply blanket final to mock targets or extension points without confirmation.
  • Never edit @generated files or files under var/cache/, vendor/, node_modules/, .Build/.
  • Never git checkout -- files outside your scope in shared trees — use git stash / git diff.
  • Never trust a warm PHPStan cache after vendor change: rm -rf /tmp/phpstan-* var/cache/phpstan first.
  • Never mass-substitute createMock → createStub — promote to expects(...)->method(...)->with(...).

Migration checklist

  • declare(strict_types=1) everywhere
  • @PER-CS, no deprecated aliases
  • PHPStan ≥9 (treatPhpDocTypesAsCertain: false); 10 for new
  • PHPat for layer boundaries
  • Return + parameter types on all methods
  • DTOs over arrays; backed enums over constants
  • PSR interfaces in type-hints
  • #[Override] (8.3+), #[SensitiveParameter] (8.2+), typed constants (8.3+)
  • readonly on DTOs/VOs/events only
  • Property hooks (8.4); array_find/any/all (8.4); pipe |> (8.5)
  • PHPUnit 12+: stubs use createStub, mocks createMock + expects (no self::any() in 13)
  • Rector withComposerBased(symfony: true) (per-version SymfonySetList::SYMFONY_* are @deprecated)

FAQ

What does the php-modernization skill do?

Use when modernizing PHP code: PHP 8.1-8.5 features, PSR/PHP-FIG/PER-CS compliance, PHPStan/Rector/PHP-CS-Fixer/PHPat tooling, DTOs/enums/readonly/property hooks, type safety. Triggers: PHP modernization, type safety, PHPStan, Rector, PHP-CS-Fixer, enum, DTO, readonly, stricttypes, property hooks, PHP 8.4, PHP 8.5.

How do I install php-modernization?

Run npx skills add https://github.com/netresearch/php-modernization-skill --skill php-modernization in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/php-modernization/ (personal) or .claude/skills/php-modernization/ (project).

Which AI agents can use php-modernization?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is php-modernization safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains php-modernization?

It is published by netresearch in netresearch/php-modernization-skill. It has 434 recorded installs.

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