PHP Modernization Skill
Modernize PHP applications to PHP 8.x with type safety, PSR compliance, and static analysis.
Expertise Areas
- PHP 8.x: Constructor promotion, readonly, enums, match, attributes, union/intersection types,
#[Override], typed constants,#[SensitiveParameter], property hooks - PSR/PER Compliance: Active PHP-FIG standards (PSR-3/4/6/7/11/14/15/16/17/18/20, PER-CS)
- Static Analysis: PHPStan (level 9+,
treatPhpDocTypesAsCertain: false), PHPat, Rector, PHP-CS-Fixer - Type Safety: DTOs/VOs over arrays, generics via PHPDoc, copy-on-write awareness
- Pitfalls: DOMDocument UTF-8 encoding, PHP-CS-Fixer deprecated aliases
Reference Documentation
| Topic | Reference File |
|---|---|
| PHP 8.0-8.5 features | references/php8-features.md |
| PSR/PER compliance | references/psr-per-compliance.md |
| PHPStan levels | references/phpstan-compliance.md |
| Static analysis tools | references/static-analysis-tools.md |
| PHP-CS-Fixer deprecations | references/php-cs-fixer-deprecations.md |
| Type safety, DTOs | references/type-safety.md |
| Request DTOs | references/request-dtos.md |
| Adapter registry | references/adapter-registry-pattern.md |
| Multi-version adapters | references/multi-version-adapters.md |
| Symfony patterns | references/symfony-patterns.md |
| TYPO3 PSR patterns | references/typo3-psr-patterns.md |
| Migration planning | references/migration-strategies.md |
Always run vendor/bin/php-cs-fixer fix --dry-run 2>&1 | grep -A 20 "Detected deprecations" to check for deprecated rules.
Running Scripts
Verify a project: scripts/verify-php-project.sh /path/to/project
Required Tools
| Tool | Requirement |
|---|---|
| PHPStan | Level 9 minimum, level 10 recommended |
| PHPat | Required for defined architectures |
| Rector | Required for automated modernization |
| PHP-CS-Fixer | Required with @PER-CS ruleset |
Core Rules
- DTOs required over arrays for structured data
- Backed enums required for fixed value sets (not constants)
- PSR interfaces for type-hinting dependencies (PSR-3, PSR-6, PSR-7, PSR-11, PSR-14, PSR-18)
See references/core-rules.md for code examples and scoring criteria.
Migration Checklist
declare(strict_types=1)in all files- PER Coding Style via PHP-CS-Fixer (
@PER-CS) with no deprecated aliases - PHPStan level 9+ (
treatPhpDocTypesAsCertain: false, level 10 for new projects) - PHPat architecture tests for layer boundaries
- Return types and parameter types on all methods
- DTOs for data transfer, no array params/returns
- Backed enums for all status/type values
- Type-hint against PSR interfaces, not implementations
#[Override]on overridden methods (PHP 8.3+)#[SensitiveParameter]on password/secret params (PHP 8.2+)- Typed class constants (PHP 8.3+)
Contributing: https://github.com/netresearch/php-modernization-skill