[RFC] Implement strrstr counterpart to strstr for consistency

Hello Internals; I've written an RFC to get feedback about adding a counterpart to strstr to make it more in line with the strpos family of functions which can be found here: https://wiki.php.net/rfc/implement-strrstr-for-consistency I've been mulling over this for quite some time as the PR [1] was created in April as there are quite some cons compared to pros which are detailed in the RFC. I'm not sure myself if this is a good idea but as feature freeze is coming close it seems to be a good time to get feedback on this. If nothing dramatic comes up or if a majority thinks this is a bad idea I'll withdraw it, otherwise expect this to be put to a vote in two weeks time. Best regards George P. Banyard [1] https://github.com/php/php-src/pull/4064