expect:// PHP 4.3.0 and up (PECL) 
This wrapper is not enabled by default: 
    In order to use the expect:// wrapper you must install
    the Expect extension
    available from PECL.
   
   Streams opened via the expect:// wrapper provide
   access to process'es stdio, stdout and stderr via PTY.
  
   
Table M-12. Wrapper Summary