* @return bool True, if matches. False, if not matching.
*/
function check_column($table_name, $col_name, $col_type, $is_null = null, $key = null, $default = null, $extra = null) {
* @return bool True, if matches. False, if not matching.
*/
function check_column($table_name, $col_name, $col_type, $is_null = null, $key = null, $default = null, $extra = null) {