Here is a list of essential tools to analyze and improve code quality in your Sylius/Symfony projects:

PHPStan

Description: PHPStan is a static analysis tool that analyzes PHP code without running it. It detects possible errors, bugs, and inconsistencies even before the code is executed.

Advantages: Improves code quality by detecting type errors, incorrect method calls, and unused variables.

Psalm

Description: Another static analysis tool for PHP, similar to PHPStan. It detects type errors and offers a code consistency check system.

Advantages: Excellent for projects using strict types and helps prevent typical errors in a Symfony or Sylius project.

PHP_CodeSniffer

Description: PHP_CodeSniffer checks that code follows coding standards. It is particularly useful for standardizing code structure within a project.

Advantages: Ensures code style consistency across the entire project, facilitating readability and collaboration between developers.

PHPMD (PHP Mess Detector)

Description: PHPMD analyzes PHP code to detect bad coding practices, such as overly long methods, complex classes, or unused variables.

Advantages: Helps identify "code smells" (warning signs of code pieces that may cause problems).

5. SonarQube

Description: SonarQube is a code quality management platform. It offers deep source code analysis, detects bugs, security vulnerabilities, and bad practices.

Advantages: Provides a project-wide overview of code quality with detailed reports and improvement suggestions.

6. EasyCodingStandard

Description: This tool allows configuring and applying coding rules using PHP_CodeSniffer and PHP-CS-Fixer. It is very useful for adapting quality rules to project needs.

Advantages: Allows easily applying coding standards and maintaining clean, compliant code.

7. Symfony Profiler

Description: The Symfony Profiler is a built-in Symfony tool that provides detailed information on performance, HTTP requests, services, and more.

Advantages: Allows analyzing application performance and detecting necessary optimizations.

8. Xdebug

Description: Xdebug is a debugging tool for PHP that allows you to track code execution, inspect variables, and better understand your application flow.

Advantages: Essential for debugging Symfony and Sylius applications, Xdebug helps find and fix logical errors in the code.

9. PHPUnit

Description: PHPUnit is a unit testing framework for PHP. It allows testing isolated functions and classes to ensure they work correctly.

Advantages: Guarantees code quality by automating tests and detecting regressions.

10. Docker + CI/CD (GitLab CI, GitHub Actions, Jenkins)

Description: Continuous Integration (CI) and Continuous Deployment (CD) allow for automatically analyzing code quality with every change made, running it in Docker containers.

Advantages: Automates testing, code analysis, and deployment processes, ensuring better code quality throughout the development cycle.