Doxygen - grouping

PHP
1

I am not able to add new item to existing Doxygen group, located somewhere in file:

/** @defgroup globconst Global constants.
 * Core constants.
 * @{ */

… here are constants, e.g.

/**
 * DIR_LIVESITE contains real web HTTP address
 */
define ('DIR_LIVESITE', 'http://'.$_SERVER['SERVER_NAME'] 
	.substr($_SERVER['SCRIPT_NAME'],0,strpos($_SERVER['SCRIPT_NAME'],'index.php')));

… here are other constants

/* @} */

This works fine, but I want to add another constant, located somewhere outside. I have tried ingroup, addtogroup, but without success. Here is one try:

/** @addtogroup globconst
* @{ */

/**
* CORE_PERIOD_(1 to 4) contain ...
*/
define('CORE_PERIOD_'.$i, true);
 /** @} */

No way. Is it possible?