A list of 8 code quality tools for long-term PHP applications, including PHP CS Fixer, PHPStan, PHPArkitect, Automated Testing, Infection, Deptrac PHP, Rector, and design patterns and principles.

Table of contents
1. PHP CS Fixer2. PHPStan3. PHPArkitect4. Automated Testing5. Infection6. Deptrac PHP7. Rector8. Design patterns and principlesConclusionSort: