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Example code of rhubarbgroup/redis-cache

Informations about the package redis-cache

Redis Object Cache for WordPress

A persistent object cache backend powered by Redis®¹. Supports Predis, PhpRedis (PECL), Relay, replication, sentinels, clustering and WP-CLI.

Object Cache Pro

A business class Redis®¹ object cache backend. Truly reliable, highly optimized, fully customizable and with a dedicated engineer when you most need it.

Installation

To get started, please see the installation instructions.

FAQ & Troubleshooting

Answers to common questions and troubleshooting of common errors can be found in the FAQ.

Configuration

The Redis Object Cache plugin comes with vast set of configuration options. If you're unsure how to use them read the installation instructions.

Configuration constant Default Description
WP_REDIS_HOST 127.0.0.1 The hostname of the Redis server
WP_REDIS_PORT 6379 The port of the Redis server
WP_REDIS_PATH The path to the unix socket of the Redis server
WP_REDIS_SCHEME tcp The scheme used to connect: tcp or unix
WP_REDIS_DATABASE 0 The database used by the cache: 0-15
WP_REDIS_PREFIX The prefix used for all cache keys to avoid data collisions (replaces WP_CACHE_KEY_SALT), should be human readable and not a "salt"
WP_REDIS_PASSWORD The password of the Redis server, supports Redis ACLs arrays: ['user', 'password']
WP_REDIS_MAXTTL 0 The maximum time-to-live of cache keys
WP_REDIS_CLIENT The client used to communicate with Redis (defaults to phpredis when installed, otherwise predis), supports phpredis, predis, relay
WP_REDIS_TIMEOUT 1 The connection timeout in seconds
WP_REDIS_READ_TIMEOUT 1 The timeout in seconds when reading/writing
WP_REDIS_IGNORED_GROUPS [] Groups that should not be cached between requests in Redis
Advanced configuration options | Configuration constant | Default | Description | | ------------------------------------ | ----------- | --------------------------------------------- | | `WP_CACHE_KEY_SALT` | | Deprecated. Replaced by `WP_REDIS_PREFIX` | | `WP_REDIS_FLUSH_TIMEOUT` | `5` | Experimental. The timeout in seconds when flushing | | `WP_REDIS_RETRY_INTERVAL` | | The number of milliseconds between retries (PhpRedis only) | | `WP_REDIS_GLOBAL_GROUPS` | `[]` | Additional groups that are considered global on multisite networks | | `WP_REDIS_METRICS_MAX_TIME` | `3600` | The maximum number of seconds metrics should be stored | | `WP_REDIS_IGBINARY` | `false` | Whether to use the igbinary PHP extension for serialization | | `WP_REDIS_DISABLED` | `false` | Emergency switch to bypass the object cache without deleting the drop-in | | `WP_REDIS_DISABLE_ADMINBAR` | `false` | Disables admin bar display | | `WP_REDIS_DISABLE_METRICS` | `false` | Disables metrics collection and display | | `WP_REDIS_DISABLE_DROPIN_CHECK` | `false` | Disables the extended drop-in write test | | `WP_REDIS_DISABLE_DROPIN_AUTOUPDATE` | `false` | Disables the drop-in auto-update | | `WP_REDIS_DISABLE_GROUP_FLUSH` | `false` | Disables group flushing with Lua script and uses `flushdb` call instead | | `WP_REDIS_DISABLE_BANNERS` | `false` | Disables promotional banners and notices | | `WP_REDIS_DISABLE_COMMENT` | `false` | Disables HTML source comment | | `WP_REDIS_SSL_CONTEXT` | `[]` | TLS connection options for `tls` or `rediss` scheme | | `WP_REDIS_MANAGER_CAPABILITY` | | The capability a user must have to manage the plugin |
Unsupported configuration options Options that exist, but **should not**, **may break without notice** in future releases and **won't receive any support** whatsoever from our team: | Configuration constant | Default | Description | | ----------------------------- | ----------- | --------------------------------------------------------------------- | | `WP_REDIS_GRACEFUL` | `false` | Prevents exceptions from being thrown, but will cause data corruption | | `WP_REDIS_SELECTIVE_FLUSH` | `false` | Uses terribly slow Lua script for flushing | | `WP_REDIS_UNFLUSHABLE_GROUPS` | `[]` | Uses terribly slow Lua script to prevent groups from being flushed |

Connections

Connecting over Unix socket
Connecting over TCP+TLS Additional TLS/SSL stream connection options for connections can be defined using `WP_REDIS_SSL_CONTEXT`:
Connecting using ACL authentication

Scaling

Redis Object Cache offers various replication, sharding, cluster and sentinel setups to users with advanced technical knowledge of Redis and PHP, that have consulted the Predis, PhpRedis or Relay documentation.

Relay Relay is a next-generation cache that keeps a partial replica of Redis' dataset in PHP's memory for ridiculously fast lookups, especially when Redis Server is not on the same machine as WordPress.
Replication
Sharding This is a PhpRedis specific feature using [`RedisArray`](https://github.com/phpredis/phpredis/blob/develop/array.md).
Redis Sentinel
Redis Cluster

WP CLI commands

Redis Object Cache has various WP CLI commands, for more information run wp help redis.

Command Description
wp redis status Shows the object cache status and diagnostics
wp redis enable Enables the object cache
wp redis disable Disables the object cache
wp redis update-dropin Updates the object cache drop-in

Actions & Filters

Redis Object Cache has various hooks and the commonly used ones are listed below.

Filter / Action Description
redis_cache_expiration Filters the cache expiration for individual keys
redis_cache_validate_dropin Filters whether the drop-in is valid
redis_cache_add_non_persistent_groups Filters the groups to be marked as non persistent
redis_cache_manager_capability Filters the capability a user needs to manage the plugin

Footnotes

¹ Redis is a registered trademark of Redis Ltd. Any rights therein are reserved to Redis Ltd. Any use by Redis Object Cache is for referential purposes only and does not indicate any sponsorship, endorsement or affiliation between Redis and Redis Object Cache.

All versions of redis-cache with dependencies

PHP Build Version
Package Version
Requires php Version ^7.2 || ^8.0
composer/installers Version ~1.0 || ~2.0
mnsami/composer-custom-directory-installer Version ^2.0
predis/predis Version ^1.1 || ^2.0
colinmollenhour/credis Version ^1.12.1
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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