[php-src] Issue #8183: New functions array_avg and array_median

Issue: https://github.com/php/php-src/issues/8183 Comment Author: iluuu1994 Hi! Historically the topic of adding more functions to the standard library has been polarizing. Many people are against the addition of functions that can be implemented in userland without a clear disadvantage. You might want to send a message to the [internals mailing list](https://www.php.net/mailing-lists.php) to get some initial impressions. This would also require an RFC.