Over a two-month period, contributed targeted improvements to core PHP projects by addressing both configuration parsing and static analysis accuracy. In php/php-src, resolved a bug in INI directive filtering by updating the regular expression logic to correctly handle leading whitespace, thereby improving the reliability of configuration parsing. Later, in phpstan/phpstan-src, enhanced static analysis by annotating APCu functions as impure, allowing the tool to better model side effects and reduce false positives for developers. These changes involved work with PHP, Makefile, and regular expressions, demonstrating a focused approach to code quality and correctness in both build systems and static analysis.