How do I write a command-line interactive PHP script?

Question

I want to write a PHP script that I can use from the command line. I want it to prompt and accept input for a few items, and then spit out some results. I want to do this in

Answer 1

The algorithm is simple:

until done:
    display prompt
    line := read a command line of input
    handle line

It's very trivial to use an array that maps commands to callback functions that handle them. The entire challenge is roughly a while loop, and two function calls. PHP also has a readline interface for more advanced shell applications.