retnull          3057 ext/curl/interface.c 				zval *retnull;
retnull          3058 ext/curl/interface.c 				MAKE_STD_ZVAL(retnull);
retnull          3059 ext/curl/interface.c 				ZVAL_NULL(retnull);
retnull          3060 ext/curl/interface.c 				CAAZ("content_type", retnull);