arrow values in command line php

A while back I decided I wanted a simple interactive interpreter for PHP. So I wrote a little PHP script that essentially did a read from stdin, and ran eval on that. Worked for most situations I was in. I'm trying to add some more features now, namely recalling a list of commands using the up and down arrow, and making each line left/right arrow editable. But I'm not sure exactly how to read the input from the arrow characters. Could someone tell me how or point me to a good resource on doing this kind of thing? Thanks, Weston