Yuxuan Xu enhanced security scanning in the joernio/joern repository by developing a PHP frontend vulnerability detection feature within queryDB. Leveraging Joern, Scala, and PHP, Yuxuan expanded automated coverage to identify vulnerabilities such as SQL injection, command injection, code injection, unrestricted file uploads, and XSS in PHP code paths. The implementation included new Joern queries and comprehensive unit tests to ensure reliability and maintainability. Yuxuan also refined PHP version check logic, reducing false negatives and improving compatibility detection. This work deepened static analysis capabilities, enabling earlier detection of insecure patterns and reducing risk in PHP frontend applications ahead of critical releases.