Johannes Schluter has a new post to his blog today about a recent addition to the latest trunk branch for PHP - a more interactive shell that will be installed right along with the language.
A few years ago I used another blog to write about "More PHP power on the command line" almost 5 years later the PHP interactive shell got a major update which went in PHP's trunk.
You can check out the commit message for more details on this new addition including paging ability and the ability to run PHP directly in the shell.