Worked on the php/php-src repository to improve the reliability and consistency of IPv4 address parsing across different platforms. Focused on aligning the behavior of the ip2long function between AIX and Linux, the work addressed a specific issue where IP addresses with leading zeros were previously handled inconsistently. By updating the C-based networking utilities, the developer ensured that such addresses are now treated as invalid on AIX, matching Linux’s approach and enhancing cross-platform parity. This fix, traceable to GH-21296, improved the correctness and portability of core networking features, leveraging skills in C programming, network programming, and system programming.