The purpose of YeAPF! framework is to give more power to the programmer while keep him/her calm and funny so he/she can focus better on programming task.
Originally oriented to the server side of web applications, now it can be used on both sides and is not required to know anything of PHP to access SQL database from client side.
You can use it on web-sites or on mobile applications as it implements Ajax, Rest, WebSocket and server side events.
The name is just a celebration to nerd humor as in YACC.