Index: trunk/core/kernel/globals.php
===================================================================
diff -u -N -r3137 -r3210
--- trunk/core/kernel/globals.php	(.../globals.php)	(revision 3137)
+++ trunk/core/kernel/globals.php	(.../globals.php)	(revision 3210)
@@ -368,4 +368,15 @@
 		eval("\$result =& {$call}({$argumentString});");
 		return $result;
 	}
+	
+	/**
+	 * Checks if constant is defined and has positive value
+	 *
+	 * @param string $const_name
+	 * @return bool
+	 */
+	function constOn($const_name)
+	{
+		return defined($const_name) && constant($const_name);
+	}
 ?>
\ No newline at end of file