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

To check if you have readline module installed, type: php -m | grep readline

If nothing displayed, install readline module: sudo apt-get install php5-readline

After module installation you can recheck it's presence with previous command, than enter interactive mode with: php -a