Allow Iterator to be used with current, next, reset, key functions

Greetings, As suggested by several reviewers of a PR[1] I recently submitted, I'd like to get feedback on letting custom Iterators be used in the current, next, reset, and key functions. If this is something to move forward with, I'll need some help with the RFC process. Recent experiences trying to use these functions with a custom Iterator, and a bug[2], led me to try and fix this. BC will occur when an object implementing Iterator is passed to one of the functions, as the interface methods will be called, instead of returning the objects properties. The old behavior should be maintained for classes that do not implement Iterator. [1] https://github.com/php/php-src/pull/2176 [2] https://bugs.php.net/bug.php?id=49369 Thanks, Dave -- David Lundgren dlundgren@syberisle.net 808.639.0365 GPG: 0x26F54D7F