Issue.1847 cluster segfault (#1850)

Fix for #1847 when dealing with NULL multi bulk replies in RedisCluster.

Adds `Redis::OPT_NULL_MULTIBULK_AS_NULL` setting to have PhpRedis
treat NULL multi bulk replies as `NULL` instead of `[]`.

Co-authored-by: Alex Offshore <offshore@aopdg.ru>

1 files changed, 1 insertions, 0 deletions

diff --git a/redis.c b/redis.c
index 585a5161..821e8bcb 100644
--- a/redis.c
+++ b/redis.c
@@ -713,6 +713,7 @@ static void add_class_constants(zend_class_entry *ce, int is_cluster) {
     zend_declare_class_constant_long(ce, ZEND_STRL("OPT_COMPRESSION"), REDIS_OPT_COMPRESSION);
     zend_declare_class_constant_long(ce, ZEND_STRL("OPT_REPLY_LITERAL"), REDIS_OPT_REPLY_LITERAL);
     zend_declare_class_constant_long(ce, ZEND_STRL("OPT_COMPRESSION_LEVEL"), REDIS_OPT_COMPRESSION_LEVEL);
+    zend_declare_class_constant_long(ce, ZEND_STRL("OPT_NULL_MULTIBULK_AS_NULL"), REDIS_OPT_NULL_MBULK_AS_NULL);
 
     /* serializer */
     zend_declare_class_constant_long(ce, ZEND_STRL("SERIALIZER_NONE"), REDIS_SERIALIZER_NONE);