(PHP 5 >= 5.1.0, PECL pdo >= 1.0.0)
Represents a prepared statement and, after the statement is executed, an associated result set.
$column
    , mixed &$param
    [, int $type
    [, int $maxlen
    [, mixed $driverdata
   ]]] )$parameter
   , mixed &$variable
   [, int $data_type = PDO::PARAM_STR
   [, int $length
   [, mixed $driver_options
  ]]] )$fetch_style
   [, int $cursor_orientation = PDO::FETCH_ORI_NEXT
   [, int $cursor_offset = 0
  ]]] )Used query string.