Description
bool 
virtual ( string filename )
   virtual() is an Apache-specific function which
   is similar to <!--#include virtual...--> in mod_include.
   It performs an Apache sub-request.  It is useful for including
   CGI scripts or .shtml files, or anything else that you would
   parse through Apache.  Note that for a CGI script, the script
   must generate valid CGI headers.  At the minimum that means it
   must generate a Content-type header.
  
   To run the sub-request, all buffers are terminated and flushed to the
   browser, pending headers are sent too.
  
This function is only supported when PHP 
is installed as an Apache module.