SonarQube 9.9 LTS is a major upgrade that brings powerful PHP analysis and over 275 rules specifically designed for PHP developers to help write pristine code fit for development and production. The new version speeds up analysis significantly through incremental analysis for pull requests, supports PHP 8.1 and 8.2, and includes features like importing Psalm and PHPStan reports, fewer false-positives, and new rules for WordPress plugin development and regular expressions. With these enhancements, SonarQube aims to assist developers in writing clean code, making it a must-have tool in the software development world.