The technical signals that predict production PHP developer quality in 2026:
PHP 8.x language features — Named arguments, match expressions, union types, typed properties, readonly classes, enums, and fibers. Developers still writing PHP 7.x-style code in 2026 are not keeping current with the language.
Framework depth vs surface knowledge — Ask for specifics: how does Laravel’s service container resolve dependencies? What is the difference between hasMany and hasManyThrough? When would you use a Symfony EventSubscriber over an EventListener? Surface-level answers reveal tutorial exposure, not production experience.
Database optimization discipline — N+1 query detection and elimination with eager loading, proper index design, query builder vs raw SQL decision-making, and migration strategies. Ask candidates to describe a real performance problem they diagnosed in a production PHP application.
Testing maturity — PHPUnit unit tests, Laravel feature tests, test doubles with Mockery, and PHPStan static analysis at a meaningful level. Test coverage percentage is less important than test design quality and whether tests are written during development.
Security awareness — SQL injection prevention beyond parameterized queries (mass assignment vulnerabilities in Eloquent, for example), CSRF protection, input validation patterns, and proper secrets management with .env files.
Composer and dependency management — Understanding of autoloading, PSR standards, semantic versioning, and dependency audit practices. Outdated Composer dependencies are a significant PHP security attack surface in 2026.