[RFC] Iteration tools

Hello everybody, As a result of the advice given in the thread "array_key_exists BC break", I have written an RFC concerning some higher order functions that, I believe, could a helpful addition to the language. Please note that I'm a userland developer and have no clue about PHP internals so please forgive any stupidities I might have said in the RFC and make the appropriate corrections. That also means that, if positive feedback is received, this RFC needs a developer with PHP internals knowledge to implement it. The RFC can be found here: http://wiki.php.net/rfc/iteration-tools Hoping that I've made sense in what I wrote there, please feel free to comment as you like. Regards, Ionut