Refresh memcached.ini provided configuration

- remove deprecated options
- add missing memcached.sess_server_failure_limit option
- comment all options default value (only needed when not default value)
  see php.ini-production which follow this convention

memcached.ini

@@ -2,45 +2,39 @@
 ; Use session locking
 ; valid values: On, Off
 ; the default is On
-memcached.sess_locking = On
-
-; !! DEPRECATED AND REMOVED in 3.x !!
-; memcached.sess_lock_wait = 150000
-
-; !! DEPRECATED AND REMOVED in 3.x !!
-; memcached.sess_lock_max_wait = 0;
+;memcached.sess_locking = On
 
 ; The minimum time, in milliseconds, to wait between session lock attempts.
 ; This value is double on each lock retry until memcached.sess_lock_wait_max
 ; is reached, after which any further retries will take sess_lock_wait_max seconds.
 ; Default is 1000.
-memcached.sess_lock_wait_min = 1000;
+;memcached.sess_lock_wait_min = 1000;
 
 ; The maximum time, in milliseconds, to wait between session lock attempts.
 ; Default is 2000.
-memcached.sess_lock_wait_max = 2000;
+;memcached.sess_lock_wait_max = 2000;
 
 ; The number of times to retry locking the session lock, not including the first attempt.
 ; Default is 5.
-memcached.sess_lock_retries = 5;
+;memcached.sess_lock_retries = 5;
 
 ; The time, in seconds, before a lock should release itself.
 ; Setting to 0 results in the default behaviour, which is to
 ; use the memcached.sess_lock_max_wait setting. If that is
 ; also 0, max_execution_time will be used.
-memcached.sess_lock_expire = 0;
+;memcached.sess_lock_expire = 0;
 
 ; memcached session key prefix
 ; valid values are strings less than 219 bytes long
 ; the default value is "memc.sess.key."
-memcached.sess_prefix = "memc.sess.key."
+;memcached.sess_prefix = "memc.sess.key."
 
 ; Whether or not to re-use the memcached connections corresponding to the value(s)
 ; of session.save_path after the execution of the script ends.
 ; Don't use this if certain settings (e.g. SASL settings, sess_binary_protocol) would
 ; be overridden between requests.
 ; Default is Off.
-memcached.sess_persistent = Off
+;memcached.sess_persistent = Off
 
 ; memcached session consistent hash mode
 ; if set to On, consistent hashing (libketama) is used
@@ -48,11 +42,15 @@ memcached.sess_persistent = Off
 ; When consistent hashing is used, one can add or remove cache
 ; node(s) without messing up too much with existing keys
 ; default is On
-memcached.sess_consistent_hash = On
+;memcached.sess_consistent_hash = On
 
 ; Allow failed memcached server to automatically be removed.
 ; Default is Off. (In previous versions, this setting was called memcached.sess_remove_failed)
-memcached.sess_remove_failed_servers = Off
+;memcached.sess_remove_failed_servers = Off
+
+; Set this value to enable the server be removed after
+; configured number of continuous times connection failure.
+;memcached.sess_server_failure_limit = 0
 
 ; Write data to a number of additional memcached servers
 ; This is "poor man's HA" as libmemcached calls it.
@@ -61,34 +59,34 @@ memcached.sess_remove_failed_servers = Off
 ; from a replica. However, if the failed memcache server
 ; becomes available again it will read the session from there
 ; which could have old data or no data at all
-memcached.sess_number_of_replicas = 0
+;memcached.sess_number_of_replicas = 0
 
 ; Use the memcached binary protocol for memcached sessions (Instead of the text protocol)
 ; libmemcached replicas work only if binary mode is enabled.
 ; However, certain proxies (such as twemproxy) will work only if the binary protocol is disabled.
 ; Default is On. In older versions of php-memcached, this setting was Off and was called memcached.sess_binary.
-memcached.sess_binary_protocol = On
+;memcached.sess_binary_protocol = On
 
 ; memcached session replica read randomize
-memcached.sess_randomize_replica_read = Off
+;memcached.sess_randomize_replica_read = Off
 
 ; memcached connect timeout value
 ; In non-blocking mode this changes the value of the timeout
 ; during socket connection in milliseconds. Specifying -1 means an infinite timeout.
-memcached.sess_connect_timeout = 1000
+;memcached.sess_connect_timeout = 1000
 
 ; Session SASL username
 ; Both username and password need to be set for SASL to be enabled
 ; In addition to this memcached.use_sasl needs to be on
-memcached.sess_sasl_username = NULL
+;memcached.sess_sasl_username = NULL
 
 ; Session SASL password
-memcached.sess_sasl_password = NULL
+;memcached.sess_sasl_password = NULL
 
 ; Set the compression type
 ; valid values are: fastlz, zlib
 ; the default is fastlz
-memcached.compression_type = "fastlz"
+;memcached.compression_type = "fastlz"
 
 ; Compression factor
 ; Store compressed value only if the compression
@@ -98,13 +96,13 @@ memcached.compression_type = "fastlz"
 ;    plain_len > comp_len * factor
 ;
 ; the default value is 1.3 (23% space saving)
-memcached.compression_factor = "1.3"
+;memcached.compression_factor = "1.3"
 
 ; The compression threshold
 ;
 ; Do not compress serialized values below this threshold.
 ; the default is 2000 bytes
-memcached.compression_threshold = 2000
+;memcached.compression_threshold = 2000
 
 ; Set the default serializer for new memcached objects.
 ; valid values are: php, igbinary, json, json_array, msgpack
@@ -119,14 +117,14 @@ memcached.compression_threshold = 2000
 ; msgpack - a cross-language binary serializer
 ;
 ; The default is igbinary if available, then msgpack if available, then php otherwise.
-memcached.serializer = "igbinary"
+;memcached.serializer = "igbinary"
 
 ; The amount of retries for failed store commands.
 ; This mechanism allows transparent fail-over to secondary servers when
 ; set/increment/decrement/setMulti operations fail on the desired server in a multi-server
 ; environment.
 ; the default is 2
-memcached.store_retry_count = 2
+;memcached.store_retry_count = 2
 
 ; Sets the default for consistent hashing for new connections.
 ; (To configure consistent hashing for session connections,
@@ -137,7 +135,7 @@ memcached.store_retry_count = 2
 ; When consistent hashing is used, one can add or remove cache
 ; node(s) without messing up too much with existing keys
 ; default is Off
-memcached.default_consistent_hash = Off
+;memcached.default_consistent_hash = Off
 
 ; Sets the default memcached protocol for new connections.
 ; (To configure the memcached protocol for connections used by sessions,
@@ -146,7 +144,7 @@ memcached.default_consistent_hash = Off
 ; If set to On, the memcached binary protocol is used by default.
 ; If set to Off, the memcached text protocol is used.
 ; Default is Off
-memcached.default_binary_protocol = Off
+;memcached.default_binary_protocol = Off
 
 ; Sets the default memcached connection timeout for new connections.
 ; (To configure the memcached connection timeout for sessions,
@@ -155,4 +153,4 @@ memcached.default_binary_protocol = Off
 ; during socket connection in milliseconds. Specifying -1 means an infinite timeout.
 ; Specifying 0 means using the memcached library's default connection timeout.
 ; Default is 0.
-memcached.default_connect_timeout = 0
+;memcached.default_connect_timeout = 0