title: Can not use command line interpreter
body: <p>I have tried to execute simple php code in the php interpreter.
  When I executed the command <code>php -a</code> I getting the message</p>
  
  <blockquote>
    <p>Interactive mode enabled</p>
  </blockquote>
  
  <p>Without any place for php input.
  But I can execute a php code through the command <code>php -r</code>.
  for example:</p>
  
  <p><code>php -r "echo 'Hello stackoverflow!';"</code></p>
  
  <blockquote>
    <p>Hello stackoverflow!</p>
  </blockquote>