memcached_behavior_set() changes the value of a particular option of the
client. It takes both a flag (listed below) and a value. For simple on or
-off options you just need to pass in a value of 1.
+off options you just need to pass in a value of 1. Calls to
+memcached_behavior_set() will flush and reset all connections.
=over 4
Turns on the no-delay feature for connecting sockets (may be faster in some
environments).
-=item MEMCACHED_BEHAVIOR_MD5_HASHING
+=item MEMCACHED_BEHAVIOR_HASH
-Makes the default hashing algorithm for keys use MD5.
+Makes the default hashing algorithm for keys use MD5. The value can be set to either MEMCACHED_HASH_DEFAULT, MEMCACHED_HASH_MD5, MEMCACHED_HASH_CRC, MEMCACHED_HASH_FNV1_64, MEMCACHED_HASH_FNV1A_64, MEMCACHED_HASH_FNV1_32, MEMCACHED_HASH_FNV1A_32, MEMCACHED_HASH_KETAMA. The behavior for all hashes but MEMCACHED_HASH_DEFAULT is identitical to the Java driver written by Dustin Sallings.
+
+=item MEMCACHED_BEHAVIOR_CACHE_LOOKUPS
+
+Memcached can cache named lookups so that DNS lookups are made only once.
+
+=item MEMCACHED_BEHAVIOR_SUPPORT_CAS
+
+Support CAS operations (this is not enabled by default at this point in the server since it imposes a slight performance penalty).
=back