SplStack          232 ext/spl/php_spl.c 	SPL_ADD_CLASS(SplStack, z_list, sub, allow, ce_flags); \
SplStack         1417 ext/spl/spl_dllist.c 	REGISTER_SPL_SUB_CLASS_EX(SplStack,           SplDoublyLinkedList,        spl_dllist_object_new, NULL);