FILTER_CALLBACK    63 filter/filter.c 	{ "callback",        FILTER_CALLBACK,               php_filter_callback        },
FILTER_CALLBACK   251 filter/filter.c 	REGISTER_LONG_CONSTANT("FILTER_CALLBACK", FILTER_CALLBACK, CONST_CS | CONST_PERSISTENT);
FILTER_CALLBACK   624 filter/filter.c 			if (filter != FILTER_CALLBACK) {
FILTER_CALLBACK    91 filter/filter_private.h || id == FILTER_CALLBACK)