original_string: public function export($include_headers = true)
      {
          $res = '';
          if ($include_headers) {
              $res .= $this->export_headers();
              $res .= "\n\n";
          }
          $res .= $this->export_entries();
  
          return $res;
      }
code: public function export($include_headers = true)
      {
          $res = '';
          if ($include_headers) {
              $res .= $this->export_headers();
              $res .= "\n\n";
          }
          $res .= $this->export_entries();
  
          return $res;
      }
code_tokens: public function export ( $ include_headers = true ) { $ res = '' ; if ( $ include_headers ) { $ res .= $ this -> export_headers ( ) ; $ res .= "\n\n" ; } $ res .= $ this -> export_entries ( ) ; return $ res ; }
docstring: Exports the whole PO file as a string.
  
  @param bool $include_headers whether to include the headers in the
  export
  
  @return string ready for inclusion in PO file string for headers and all
  the enrtries
docstring_tokens: Exports the whole PO file as a string .