PHP operations on HTTP Session sessions

  session_register("A");

  $A = array("A1", "A2");

  $str = session_encode();

  $openfile = @fopen("saveme.txt","w") or die ("This operation cannot be performed.");

  @fwrite($openfile, $str);
  @fclose($openfile) or die ("This operation cannot be performed.");

  echo "Success!!";
?>