convert javascript to php

I want someone to convert some javascript to a php function. overall this doesn't seem to be a major challenge if you understand javascript & php. most of what I am understanding is a simple replace function using arrays. to test before payement, there should be a form that allows me to paste text into, after submit, should do 2 things 1) generate a block allowing me to view the code 2) display the code working (don't worry it's all html or will be 8-)) would be nice if someone could do this immediately. need this done within the next 8 hours or so.