PHP 8.x modernization patterns for upgrading legacy PHP applications. This skill should be used when modernizing PHP codebases to PHP 8.1/8.2/8.3, implementing type safety and strict typing, adopting Symfony best practices, or achieving PHPStan level 9+ compliance. Covers constructor property promotion, readonly classes, enums, attributes, generics via PHPDoc, and migration strategies. By Netresearch.
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references/migration-strategies.mdreferences/php8-features.mdreferences/phpstan-compliance.mdreferences/symfony-patterns.mdreferences/type-safety.mdscripts/verify-php-project.sh