Support virtual bucket distribution.

Author: andreiz

php_memcached.c

@@ -3675,6 +3675,9 @@ static void php_memc_register_constants(INIT_FUNC_ARGS)
 	REGISTER_MEMC_CLASS_CONST_LONG(OPT_DISTRIBUTION, MEMCACHED_BEHAVIOR_DISTRIBUTION);
 	REGISTER_MEMC_CLASS_CONST_LONG(DISTRIBUTION_MODULA, MEMCACHED_DISTRIBUTION_MODULA);
 	REGISTER_MEMC_CLASS_CONST_LONG(DISTRIBUTION_CONSISTENT, MEMCACHED_DISTRIBUTION_CONSISTENT);
+#if defined(LIBMEMCACHED_VERSION_HEX) && LIBMEMCACHED_VERSION_HEX >= 0x00049000
+	REGISTER_MEMC_CLASS_CONST_LONG(DISTRIBUTION_VIRTUAL_BUCKET, MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET);
+#endif
 	REGISTER_MEMC_CLASS_CONST_LONG(OPT_LIBKETAMA_COMPATIBLE, MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED);
 	REGISTER_MEMC_CLASS_CONST_LONG(OPT_LIBKETAMA_HASH, MEMCACHED_BEHAVIOR_KETAMA_HASH);
 	REGISTER_MEMC_CLASS_CONST_LONG(OPT_TCP_KEEPALIVE, MEMCACHED_BEHAVIOR_TCP_KEEPALIVE);