Can not use command line interpreter

Question

I have tried to execute simple php code in the php interpreter. When I executed the command php -a I getting the message

Interactive mode ena

Answer 1

type php -m and make sure you have the readline module. If you don't you won't be able to use it.

http://www.php.net/manual/en/features.commandline.interactive.php

As of PHP 5.1.0, the CLI SAPI provides an interactive shell using the -a option if PHP is compiled with the --with-readline option.