ZVAL_ZVAL         625 Zend/zend_API.h #define RETVAL_ZVAL(zv, copy, dtor)		ZVAL_ZVAL(return_value, zv, copy, dtor)
ZVAL_ZVAL         216 Zend/zend_interfaces.c 		ZVAL_ZVAL(key, &retval, 1, 1);
ZVAL_ZVAL        2098 ext/spl/spl_directory.c 		ZVAL_ZVAL(return_value, &retval, 0, 0);