Installation
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Installing/Configuring
PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Memcached Configure Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
memcached.sess_locking | 1 | PHP_INI_ALL |
memcached.sess_consistent_hash | 0 | PHP_INI_ALL |
memcached.sess_binary | 0 | PHP_INI_ALL |
memcached.sess_lock_wait | 150000 | PHP_INI_ALL |
memcached.sess_prefix | memc.sess.key. | PHP_INI_ALL |
memcached.sess_number_of_replicas | 0 | PHP_INI_ALL |
memcached.sess_randomize_replica_read | 0 | PHP_INI_ALL |
memcached.sess_remove_failed | 0 | PHP_INI_ALL |
memcached.compression_type | fastlz | PHP_INI_ALL |
memcached.compression_factor | 1.3 | PHP_INI_ALL |
memcached.compression_threshold | 2000 | PHP_INI_ALL |
memcached.serializer | php | PHP_INI_ALL |
memcached.use_sasl | 0 | PHP_INI_SYSTEM |

Here's a short explanation of the configuration directives.

`memcached.sess_locking` integer

  Use session locking. Valid values: On, Off, the default is On.

`memcached.sess_consistent_hash` integer

  Memcached session consistent hash mode. If set to On, consistent hashing is used for session handling. When consistent hashing is used, one can add or remove cache node(s) without messing up too much with existing keys. The default is Off.

`memcached.sess_binary` integer

  Use memcached session binary mode. Libmemcached replicas only work if binary mode is enabled. The default is Off.

`memcached.sess_lock_wait` integer

  Session spin lock retry wait time in microseconds. Be carefull when setting this value. Valid values are integers, where 0 is interpreted as the default value. Negative values result in a reduces locking to a try lock. The default is 150000.

`memcached.sess_prefix` string

  Memcached session key prefix. Valid values are strings less than 219 bytes long. The default value is "memc.sess.key."

`memcached.sess_number_of_replicas` integer

  The memcached session number of replicas.

`memcached.sess_randomize_replica_read` integer

  Memcached session replica read randomize.

`memcached.sess_remove_failed` integer

  Allow failed memcached server to automatically be removed.

`memcached.compression_type` string

  Set the compression type, valid values are: fastlz, zlib. The default is fastlz.

`memcached.compression_factor` float

  Compression factor. Store compressed value only if the compression factor (saving) exceeds the set limit. Store compressed if: plain_len > comp_len * factor. The default value is 1.3 (23% space saving).

`memcached.compression_threshold` integer

  The compression threshold. Do not compress serialized values below this threshold. The default is 2000 bytes.

`memcached.serializer` string

  Set the default serializer for new memcached objects. Valid values are: php, igbinary, json, json_array.

  json

    Standard php JSON encoding. This serializer is fast and compact but only works on UTF-8 encoded data and does not fully implement serializing. See the JSON extension.

  json_array

    As json, but decodes into arrays.

  php

    The standard PHP serializer.

  igbinary

    A binary serializer

  The default is igbinary if available and php otherwise.

`memcached.use_sasl` integer

  Use SASL authentication for connections. Valid values: On, Off. The default is Off.