original_string: public function export_headers()
      {
          $header_string = '';
          foreach ($this->headers as $header => $value) {
              $header_string .= "$header: $value\n";
          }
          $poified = self::poify($header_string);
          if ($this->comments_before_headers) {
              $before_headers = self::prepend_each_line(
                  rtrim($this->comments_before_headers) . "\n",
                  '# '
              );
          } else {
              $before_headers = '';
          }
  
          return rtrim("{$before_headers}msgid \"\"\nmsgstr $poified");
      }
code: public function export_headers()
      {
          $header_string = '';
          foreach ($this->headers as $header => $value) {
              $header_string .= "$header: $value\n";
          }
          $poified = self::poify($header_string);
          if ($this->comments_before_headers) {
              $before_headers = self::prepend_each_line(
                  rtrim($this->comments_before_headers) . "\n",
                  '# '
              );
          } else {
              $before_headers = '';
          }
  
          return rtrim("{$before_headers}msgid \"\"\nmsgstr $poified");
      }
code_tokens: public function export_headers ( ) { $ header_string = '' ; foreach ( $ this -> headers as $ header => $ value ) { $ header_string .= "$header: $value\n" ; } $ poified = self :: poify ( $ header_string ) ; if ( $ this -> comments_before_headers ) { $ before_headers = self :: prepend_each_line ( rtrim ( $ this -> comments_before_headers ) . "\n" , '# ' ) ; } else { $ before_headers = '' ; } return rtrim ( "{$before_headers}msgid \"\"\nmsgstr $poified" ) ; }
docstring: Exports headers to a PO entry.
  
  @return string msgid/msgstr PO entry for this PO file headers, doesn't
  contain newline at the end
docstring_tokens: Exports headers to a PO entry .