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9 community-ranked rules
Write rules for yourself that prevent the same mistake
This belongs in automated testing or linting pipelines, not in agent instructions.
Follow PSR-12 coding style. Use `camelCase` for methods, `PascalCase` for classes, `UPPER_CASE` for constants.
This belongs in a php-cs-fixer config with 'PSR-12' ruleset or PHP_CodeSniffer with PSR12 standard, not in agent instructions.
Use plan mode for verification steps, not just building
Adds minimal value over the 0922494eee667d5d rule as it restates plan mode use without distinct actionable guidance.
Validate all external inputs at system boundaries. Trust nothing from users, APIs, or files.
Saves time by specifying all three untrusted input sources (users, APIs, files) as requiring validation at system boundaries.
Use strict types: declare `declare(strict_types=1)` at the top of every PHP file — it prevents silent type coercion in function arguments.
Design a minimal, intuitive public API. Every exported symbol is a commitment — keep the surface area small.
Avoid N+1 query patterns — use batch loading, JOINs, or DataLoader patterns.
Use PHP 8.2+ features: readonly classes, enums, named arguments, fibers, union/intersection types.
Write E2E tests for critical user journeys: signup, login, checkout, core workflows.
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