PhpRedis
The phpredis extension provides an API for communicating with the Redis key-value store. It is released under the PHP License, version 3.01. This code has been developed and maintained by Owlient from November 2009 to March 2011.
You can send comments, patches, questions here on github, to michael.grunder@gmail.com (Twitter, Mastodon), p.yatsukhnenko@gmail.com (@yatsukhnenko), or n.favrefelix@gmail.com (@yowgi).
API Documentation
These are a work in progress, but will eventually replace our ONE README TO RULE THEM ALL docs.
Supporting the project
PhpRedis will always be free and open source software, but if you or your company has found it useful please consider supporting the project. Developing a large, complex, and performant library like PhpRedis takes a great deal of time and effort, and support would be appreciated!
The best way to support the project is through GitHub sponsors. Many of the reward tiers grant access to our slack channel where myself and Pavlo are regularly available to answer questions. Additionally this will allow you to provide feedback on which fixes and new features to prioritize.
You can also make a one-time contribution with
Sponsors
Table of contents
Installing/Configuring
Installation
For everything you should need to install PhpRedis on your system, see the INSTALL.md page.
PHP Session handler
phpredis can be used to store PHP sessions. To do this, configure session.save_handler and session.save_path in your php.ini to tell phpredis where to store the sessions:
session.save_handler = redis
session.save_path = "tcp://host1:6379?weight=1, tcp://host2:6379?weight=2&timeout=2.5, tcp://host3:6379?weight=2&read_timeout=2.5"
session.save_path can have a simple host:port format too, but you need to provide the tcp:// scheme if you want to use the parameters. The following parameters are available:
- weight (integer): the weight of a host is used in comparison with the others in order to customize the session distribution on several hosts. If host A has twice the weight of host B, it will get twice the amount of sessions. In the example, host1 stores 20% of all the sessions (1/(1+2+2)) while host2 and host3 each store 40% (2/(1+2+2)). The target host is determined once and for all at the start of the session, and doesn't change. The default weight is 1.
- timeout (float): the connection timeout to a redis host, expressed in seconds. If the host is unreachable in that amount of time, the session storage will be unavailable for the client. The default timeout is very high (86400 seconds).
- persistent (integer, should be 1 or 0): defines if a persistent connection should be used.
- prefix (string, defaults to "PHPREDIS_SESSION:"): used as a prefix to the Redis key in which the session is stored. The key is composed of the prefix followed by the session ID.
- auth (string, or an array with one or two elements): used to authenticate with the server prior to sending commands.
- database (integer): selects a different database.
Sessions have a lifetime expressed in seconds and stored in the INI variable "session.gc_maxlifetime". You can change it with ini_set().
The session handler requires a version of Redis supporting EX and NX options of SET command (at least 2.6.12).
phpredis can also connect to a unix domain socket: session.save_path = "unix:///var/run/redis/redis.sock?persistent=1&weight=1&database=0".
Session locking
Support: Locking feature is currently only supported for Redis setup with single master instance (e.g. classic master/slave Sentinel environment). So locking may not work properly in RedisArray or RedisCluster environments.
Following INI variables can be used to configure session locking:
; Should the locking be enabled? Defaults to: 0.
redis.session.locking_enabled = 1
; How long should the lock live (in seconds)? Defaults to: value of max_execution_time.
redis.session.lock_expire = 60
; How long to wait between attempts to acquire lock, in microseconds (µs)?. Defaults to: 20000
redis.session.lock_wait_time = 50000
; Maximum number of times to retry (-1 means infinite). Defaults to: 100
redis.session.lock_retries = 2000
Running the unit tests
phpredis uses a small custom unit test suite for testing functionality of the various classes. To run tests, simply do the following:
# Run tests for Redis class (note this is the default)
php tests/TestRedis.php --class Redis
# Run tests for RedisArray class
tests/mkring.sh start
php tests/TestRedis.php --class RedisArray
tests/mkring.sh stop
# Run tests for the RedisCluster class
tests/make-cluster.sh start
php tests/TestRedis.php --class RedisCluster
tests/make-cluster.sh stop
# Run tests for RedisSentinel class
php tests/TestRedis.php --class RedisSentinel
Note that it is possible to run only tests which match a substring of the test itself by passing the additional argument '--test ' when invoking.
# Just run the 'echo' test
php tests/TestRedis.php --class Redis --test echo
Classes and methods
Usage
Class Redis
Description: Creates a Redis client
Example
$redis = new Redis();Starting from version 6.0.0 it's possible to specify configuration options.
This allows to connect lazily to the server without explicitly invoking connect command.
Example
$redis = new Redis([
'host' => '127.0.0.1',
'port' => 6379,
'connectTimeout' => 2.5,
'auth' => ['phpredis', 'phpredis'],
'ssl' => ['verify_peer' => false],
'backoff' => [
'algorithm' => Redis::BACKOFF_ALGORITHM_DECORRELATED_JITTER,
'base' => 500,
'cap' => 750,
],
]);Parameters
host: string. can be a host, or the path to a unix domain socket.
port: int (default is 6379, should be -1 for unix domain socket)
connectTimeout: float, value in seconds (default is 0 meaning unlimited)
retryInterval: int, value in milliseconds (optional)
readTimeout: float, value in seconds (default is 0 meaning unlimited)
persistent: mixed, if value is string then it used as persistend id, else value casts to boolean
auth: mixed, authentication information
ssl: array, SSL context options
Class RedisException
phpredis throws a RedisException object if it can't reach the Redis server. That can happen in case of connectivity issues,
if the Redis service is down, or if the redis host is overloaded. In any other problematic case that does not involve an
unreachable server (such as a key not existing, an invalid command, etc), phpredis will return FALSE.
Predefined constants
Description: Available Redis Constants
Redis data types, as returned by type
Redis::REDIS_STRING - String
Redis::REDIS_SET - Set
Redis::REDIS_LIST - List
Redis::REDIS_ZSET - Sorted set
Redis::REDIS_HASH - Hash
Redis::REDIS_NOT_FOUND - Not found / other
@TODO: OPT_SERIALIZER, AFTER, BEFORE,...
Connection
- connect, open - Connect to a server
- pconnect, popen - Connect to a server (persistent)
- auth - Authenticate to the server
- select - Change the selected database for the current connection
- swapdb - Swaps two Redis databases
- close - Close the connection
- setOption - Set client option
- getOption - Get client option
- ping - Ping the server
- echo - Echo the given string
connect, open
Description: Connects to a Redis instance.
Parameters
host: string. can be a host, or the path to a unix domain socket. Starting from version 5.0.0 it is possible to specify schema
port: int, optional
timeout: float, value in seconds (optional, default is 0 meaning it will use default_socket_timeout)
reserved: should be '' if retry_interval is specified
retry_interval: int, value in milliseconds (optional)
read_timeout: float, value in seconds (optional, default is 0 meaning it will use default_socket_timeout)
others: array, with PhpRedis >= 5.3.0, it allows setting auth and stream configuration.
Return value
BOOL: TRUE on success, FALSE on error.
Example
$redis->connect('127.0.0.1', 6379);
$redis->connect('127.0.0.1'); // port 6379 by default
$redis->connect('tls://127.0.0.1', 6379); // enable transport level security.
$redis->connect('tls://127.0.0.1'); // enable transport level security, port 6379 by default.
$redis->connect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout.
$redis->connect('/tmp/redis.sock'); // unix domain socket.
$redis->connect('127.0.0.1', 6379, 1, '', 100); // 1 sec timeout, 100ms delay between reconnection attempts.
$redis->connect('/tmp/redis.sock', 0, 1.5, NULL, 0, 1.5); // Unix socket with 1.5s timeouts (connect and read)
/* With PhpRedis >= 5.3.0 you can specify authentication and stream information on connect */
$redis->connect('127.0.0.1', 6379, 1, '', 0, 0, ['auth' => ['phpredis', 'phpredis']]);Note: open is an alias for connect and will be removed in future versions of phpredis.
pconnect, popen
Description: Connects to a Redis instance or reuse a connection already established with pconnect/popen.
The connection will not be closed on end of request until the php process ends. So be prepared for too many open FD's errors (specially on redis server side) when using persistent connections on many servers connecting to one redis server.
Also more than one persistent connection can be made identified by either host + port + timeout or host + persistent_id or unix socket + timeout.
Starting from version 4.2.1, it became possible to use connection pooling by setting INI variable redis.pconnect.pooling_enabled to 1.
This feature is not available in threaded versions. pconnect and popen then working like their non
persistent equivalents.
Parameters
host: string. can be a host, or the path to a unix domain socket. Starting from version 5.0.0 it is possible to specify schema
port: int, optional
timeout: float, value in seconds (optional, default is 0 meaning it will use default_socket_timeout)
persistent_id: string. identity for the requested persistent connection
retry_interval: int, value in milliseconds (optional)
read_timeout: float, value in seconds (optional, default is 0 meaning it will use default_socket_timeout)
Return value
BOOL: TRUE on success, FALSE on error.
Example
$redis->pconnect('127.0.0.1', 6379);
$redis->pconnect('127.0.0.1'); // port 6379 by default - same connection like before.
$redis->pconnect('tls://127.0.0.1', 6379); // enable transport level security.
$redis->pconnect('tls://127.0.0.1'); // enable transport level security, port 6379 by default.
$redis->pconnect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout and would be another connection than the two before.
$redis->pconnect('127.0.0.1', 6379, 2.5, 'x'); // x is sent as persistent_id and would be another connection than the three before.
$redis->pconnect('/tmp/redis.sock'); // unix domain socket - would be another connection than the four before.Note: popen is an alias for pconnect and will be removed in future versions of phpredis.
auth
Description: Authenticate the connection using a password or a username and password. Warning: The password is sent in plain-text over the network.
Parameters
MIXED: password
Return value
BOOL: TRUE if the connection is authenticated, FALSE otherwise.
Note: In order to authenticate with a username and password you need Redis >= 6.0.
Example
/* Authenticate with the password 'foobared' */
$redis->auth('foobared');
/* Authenticate with the username 'phpredis', and password 'haxx00r' */
$redis->auth(['phpredis', 'haxx00r']);
/* Authenticate with the password 'foobared' */
$redis->auth(['foobared']);
/* You can also use an associative array specifying user and pass */
$redis->auth(['user' => 'phpredis', 'pass' => 'phpredis']);
$redis->auth(['pass' => 'phpredis']);select
Description: Change the selected database for the current connection.
Parameters
INTEGER: dbindex, the database number to switch to.
Return value
TRUE in case of success, FALSE in case of failure.
Example
See method for example: move
swapdb
Description: Swap one Redis database with another atomically
Parameters
INTEGER: db1
INTEGER: db2
Return value
TRUE on success and FALSE on failure.
Note: Requires Redis >= 4.0.0
Example
$redis->swapdb(0, 1); /* Swaps DB 0 with DB 1 atomically */close
Description: Disconnects from the Redis instance.
Note: Closing a persistent connection requires PhpRedis >= 4.2.0.
Parameters
None.
Return value
BOOL: TRUE on success, FALSE on failure.
setOption
Description: Set client option.
Parameters
parameter name
parameter value
Return value
BOOL: TRUE on success, FALSE on error.
Example
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_NONE); // Don't serialize data
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP); // Use built-in serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_IGBINARY); // Use igBinary serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_MSGPACK); // Use msgpack serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_JSON); // Use JSON to serialize/unserialize
$redis->setOption(Redis::OPT_PREFIX, 'myAppName:'); // use custom prefix on all keys
/* Options for the SCAN family of commands, indicating whether to abstract
empty results from the user. If set to SCAN_NORETRY (the default), phpredis
will just issue one SCAN command at a time, sometimes returning an empty
array of results. If set to SCAN_RETRY, phpredis will retry the scan command
until keys come back OR Redis returns an iterator of zero
*/
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
/* Scan can also be configured to automatically prepend the currently set PhpRedis
prefix to any MATCH pattern. */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_PREFIX);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NOPREFIX);getOption
Description: Get client option.
Parameters
parameter name
Return value
Parameter value.
Example
// return Redis::SERIALIZER_NONE, Redis::SERIALIZER_PHP,
// Redis::SERIALIZER_IGBINARY, Redis::SERIALIZER_MSGPACK or Redis::SERIALIZER_JSON
$redis->getOption(Redis::OPT_SERIALIZER);ping
Description: Check the current connection status.
Prototype
$redis->ping([string $message]);Return value
Mixed: This method returns TRUE on success, or the passed string if called with an argument.
Example
/* When called without an argument, PING returns `TRUE` */
$redis->ping();
/* If passed an argument, that argument is returned. Here 'hello' will be returned */
$redis->ping('hello');Note: Prior to PhpRedis 5.0.0 this command simply returned the string +PONG.
echo
Description: Sends a string to Redis, which replies with the same string
Parameters
STRING: The message to send.
Return value
STRING: the same message.
Retry and backoff
Maximum retries
You can set and get the maximum retries upon connection issues using the OPT_MAX_RETRIES option. Note that this is the number of retries, meaning if you set this option to n, there will be a maximum n+1 attemps overall. Defaults to 10.
Example
$redis->setOption(Redis::OPT_MAX_RETRIES, 5);
$redis->getOption(Redis::OPT_MAX_RETRIES);Backoff algorithms
You can set the backoff algorithm using the Redis::OPT_BACKOFF_ALGORITHM option and choose among the following algorithms described in this blog post by Marc Brooker from AWS: Exponential Backoff And Jitter:
- Default:
Redis::BACKOFF_ALGORITHM_DEFAULT - Decorrelated jitter:
Redis::BACKOFF_ALGORITHM_DECORRELATED_JITTER - Full jitter:
Redis::BACKOFF_ALGORITHM_FULL_JITTER - Equal jitter:
Redis::BACKOFF_ALGORITHM_EQUAL_JITTER - Exponential:
Redis::BACKOFF_ALGORITHM_EXPONENTIAL - Uniform:
Redis::BACKOFF_ALGORITHM_UNIFORM - Constant:
Redis::BACKOFF_ALGORITHM_CONSTANT
These algorithms depend on the base and cap parameters, both in milliseconds, which you can set using the Redis::OPT_BACKOFF_BASE and Redis::OPT_BACKOFF_CAP options, respectively.
Example
$redis->setOption(Redis::OPT_BACKOFF_ALGORITHM, Redis::BACKOFF_ALGORITHM_DECORRELATED_JITTER);
$redis->setOption(Redis::OPT_BACKOFF_BASE, 500); // base for backoff computation: 500ms
$redis->setOption(Redis::OPT_BACKOFF_CAP, 750); // backoff time capped at 750msServer
- acl - Manage Redis ACLs
- bgRewriteAOF - Asynchronously rewrite the append-only file
- bgSave - Asynchronously save the dataset to disk (in background)
- config - Get or Set the Redis server configuration parameters
- dbSize - Return the number of keys in selected database
- flushAll - Remove all keys from all databases
- flushDb - Remove all keys from the current database
- info - Get information and statistics about the server
- lastSave - Get the timestamp of the last disk save
- save - Synchronously save the dataset to disk (wait to complete)
- slaveOf - Make the server a slave of another instance, or promote it to master
- time - Return the current server time
- slowLog - Access the Redis slowLog entries
acl
Description: Execute the Redis ACL command.
Parameters
variable: Minumum of one argument for Redis and two for RedisCluster.
Example
$redis->acl('USERS'); /* Get a list of users */
$redis->acl('LOG'); /* See log of Redis' ACL subsystem */Note: In order to user the ACL command you must be communicating with Redis >= 6.0 and be logged into an account that has access to administration commands such as ACL. Please reference this tutorial for an overview of Redis 6 ACLs and the redis command reference for every ACL subcommand.
Note: If you are connecting to Redis server >= 4.0.0 you can remove a key with the unlink method in the exact same way you would use del. The Redis unlink command is non-blocking and will perform the actual deletion asynchronously.
bgRewriteAOF
Description: Start the background rewrite of AOF (Append-Only File)
Parameters
None.
Return value
BOOL: TRUE in case of success, FALSE in case of failure.
Example
$redis->bgRewriteAOF();bgSave
Description: Asynchronously save the dataset to disk (in background)
Parameters
None.
Return value
BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.
Example
$redis->bgSave();config
Description: Get or Set the Redis server configuration parameters.
Prototype
$redis->config(string $operation, string|array|null $key = NULL, ?string $value = NULL): mixed;Return value
Associative array for GET, key(s) -> value(s)
bool for SET, RESETSTAT, and REWRITE
Examples
$redis->config("GET", "*max-*-entries*");
$redis->config("SET", ['timeout', 'loglevel']);
$redis->config("SET", "dir", "/var/run/redis/dumps/");
$redis->config("SET", ['timeout' => 128, 'loglevel' => 'warning']);
$redis->config('RESETSTAT');dbSize
Description: Return the number of keys in selected database.
Parameters
None.
Return value
INTEGER: DB size, in number of keys.
Example
$count = $redis->dbSize();
echo "Redis has $count keys\n";flushAll
Description: Remove all keys from all databases.
Parameters
async (bool) requires server version 4.0.0 or greater
Return value
BOOL: Always TRUE.
Example
$redis->flushAll();flushDb
Description: Remove all keys from the current database.
Prototype
$redis->flushdb(?bool $sync = NULL): Redis|bool;Return value
BOOL: This command returns true on success and false on failure.
Example
$redis->flushDb();info
Description: Get information and statistics about the server
Returns an associative array that provides information about the server. Passing no arguments to INFO will call the standard REDIS INFO command, which returns information such as the following:
- redis_version
- arch_bits
- uptime_in_seconds
- uptime_in_days
- connected_clients
- connected_slaves
- used_memory
- changes_since_last_save
- bgsave_in_progress
- last_save_time
- total_connections_received
- total_commands_processed
- role
You can pass a variety of options to INFO (per the Redis documentation), which will modify what is returned.
Parameters
option: The option to provide redis (e.g. "COMMANDSTATS", "CPU")
Example
$redis->info(); /* standard redis INFO command */
$redis->info("COMMANDSTATS"); /* Information on the commands that have been run (>=2.6 only)
$redis->info("CPU"); /* just CPU information from Redis INFO */lastSave
Description: Returns the timestamp of the last disk save.
Parameters
None.
Return value
INT: timestamp.
Example
$redis->lastSave();save
Description: Synchronously save the dataset to disk (wait to complete)
Parameters
None.
Return value
BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.
Example
$redis->save();slaveOf
Description: Changes the slave status
Parameters
Either host (string) and port (int), or no parameter to stop being a slave.
Return value
BOOL: TRUE in case of success, FALSE in case of failure.
Example
$redis->slaveOf('10.0.1.7', 6379);
/* ... */
$redis->slaveOf();time
Description: Return the current server time.
Parameters
(none)
Return value
If successful, the time will come back as an associative array with element zero being the unix timestamp, and element one being microseconds.
Examples
$redis->time();slowLog
Description: Access the Redis slowLog
Parameters
Operation (string): This can be either GET, LEN, or RESET
Length (integer), optional: If executing a SLOWLOG GET command, you can pass an optional length.
Return value
The return value of SLOWLOG will depend on which operation was performed. SLOWLOG GET: Array of slowLog entries, as provided by Redis SLOGLOG LEN: Integer, the length of the slowLog SLOWLOG RESET: Boolean, depending on success
Examples
// Get ten slowLog entries
$redis->slowLog('get', 10);
// Get the default number of slowLog entries
$redis->slowLog('get');
// Reset our slowLog
$redis->slowLog('reset');
// Retrieve slowLog length
$redis->slowLog('len');Keys and Strings
Strings
- append - Append a value to a key
- bitCount - Count set bits in a string
- bitOp - Perform bitwise operations between strings
- decr, decrBy - Decrement the value of a key
- get - Get the value of a key
- getBit - Returns the bit value at offset in the string value stored at key
- getRange - Get a substring of the string stored at a key
- getSet - Set the string value of a key and return its old value
- incr, incrBy - Increment the value of a key
- incrByFloat - Increment the float value of a key by the given amount
- mGet, getMultiple - Get the values of all the given keys
- mSet, mSetNX - Set multiple keys to multiple values
- set - Set the string value of a key
- setBit - Sets or clears the bit at offset in the string value stored at key
- setEx, pSetEx - Set the value and expiration of a key
- setNx - Set the value of a key, only if the key does not exist
- setRange - Overwrite part of a string at key starting at the specified offset
- strLen - Get the length of the value stored in a key
Keys
- del, delete, unlink - Delete a key
- dump - Return a serialized version of the value stored at the specified key.
- exists - Determine if a key exists
- expire, setTimeout, pexpire - Set a key's time to live in seconds
- expireAt, pexpireAt - Set the expiration for a key as a UNIX timestamp
- keys, getKeys - Find all keys matching the given pattern
- scan - Scan for keys in the keyspace (Redis >= 2.8.0)
- migrate - Atomically transfer a key from a Redis instance to another one
- move - Move a key to another database
- object - Inspect the internals of Redis objects
- persist - Remove the expiration from a key
- randomKey - Return a random key from the keyspace
- rename, renameKey - Rename a key
- renameNx - Rename a key, only if the new key does not exist
- type - Determine the type stored at key
- sort - Sort the elements in a list, set or sorted set
- ttl, pttl - Get the time to live for a key
- restore - Create a key using the provided serialized value, previously obtained with dump.
get
Description: Get the value related to the specified key
Parameters
key
Return value
String or Bool: If key didn't exist, FALSE is returned. Otherwise, the value related to this key is returned.
Examples
$redis->get('key');set
Description: Set the string value in argument as value of the key. If you're using Redis >= 2.6.12, you can pass extended options as explained below
Parameters
Key
Value
Timeout or Options Array (optional). If you pass an integer, phpredis will redirect to SETEX, and will try to use Redis >= 2.6.12 extended options if you pass an array with valid values
Return value
Bool TRUE if the command is successful.
Examples
// Simple key -> value set
$redis->set('key', 'value');
// Will redirect, and actually make an SETEX call
$redis->set('key','value', 10);
// Will set the key, if it doesn't exist, with a ttl of 10 seconds
$redis->set('key', 'value', ['nx', 'ex'=>10]);
// Will set a key, if it does exist, with a ttl of 1000 milliseconds
$redis->set('key', 'value', ['xx', 'px'=>1000]);setEx, pSetEx
Description: Set the string value in argument as value of the key, with a time to live. PSETEX uses a TTL in milliseconds.
Parameters
Key TTL Value
Return value
Bool TRUE if the command is successful.
Examples
$redis->setEx('key', 3600, 'value'); // sets key → value, with 1h TTL.
$redis->pSetEx('key', 100, 'value'); // sets key → value, with 0.1 sec TTL.setNx
Description: Set the string value in argument as value of the key if the key doesn't already exist in the database.
Parameters
key value
Return value
Bool TRUE in case of success, FALSE in case of failure.
Examples
$redis->setNx('key', 'value'); /* return TRUE */
$redis->setNx('key', 'value'); /* return FALSE */del, delete, unlink
Description: Remove specified keys.
Parameters
An array of keys, or an undefined number of parameters, each a key: key1 key2 key3 ... keyN
Note: If you are connecting to Redis server >= 4.0.0 you can remove a key with the unlink method in the exact same way you would use del. The Redis unlink command is non-blocking and will perform the actual deletion asynchronously.
Return value
Long Number of keys deleted.
Examples
$redis->set('key1', 'val1');
$redis->set('key2', 'val2');
$redis->set('key3', 'val3');
$redis->set('key4', 'val4');
$redis->del('key1', 'key2'); /* return 2 */
$redis->del(['key3', 'key4']); /* return 2 */
/* If using Redis >= 4.0.0 you can call unlink */
$redis->unlink('key1', 'key2');
$redis->unlink(['key1', 'key2']);Note: delete is an alias for del and will be removed in future versions of phpredis.
exists
Description: Verify if the specified key exists.
Parameters
key
Return value
long: The number of keys tested that do exist.
Examples
$redis->set('key', 'value');
$redis->exists('key'); /* 1 */
$redis->exists('NonExistingKey'); /* 0 */
$redis->mset(['foo' => 'foo', 'bar' => 'bar', 'baz' => 'baz']);
$redis->exists(['foo', 'bar', 'baz']); /* 3 */
$redis->exists('foo', 'bar', 'baz'); /* 3 */Note: This function took a single argument and returned TRUE or FALSE in phpredis versions < 4.0.0.
incr, incrBy
Description: Increment the number stored at key by one. If the second argument is filled, it will be used as the integer value of the increment.
Parameters
key
value: value that will be added to key (only for incrBy)
Return value
INT the new value
Examples
$redis->incr('key1'); /* key1 didn't exists, set to 0 before the increment */
/* and now has the value 1 */
$redis->incr('key1'); /* 2 */
$redis->incr('key1'); /* 3 */
$redis->incr('key1'); /* 4 */
// Will redirect, and actually make an INCRBY call
$redis->incr('key1', 10); /* 14 */
$redis->incrBy('key1', 10); /* 24 */incrByFloat
Description: Increment the key with floating point precision.
Parameters
key
value: (float) value that will be added to the key
Return value
FLOAT the new value
Examples
$redis->incrByFloat('key1', 1.5); /* key1 didn't exist, so it will now be 1.5 */
$redis->incrByFloat('key1', 1.5); /* 3 */
$redis->incrByFloat('key1', -1.5); /* 1.5 */
$redis->incrByFloat('key1', 2.5); /* 4 */decr, decrBy
Description: Decrement the number stored at key by one. If the second argument is filled, it will be used as the integer value of the decrement.
Parameters
key
value: value that will be subtracted to key (only for decrBy)
Return value
INT the new value
Examples
$redis->decr('key1'); /* key1 didn't exists, set to 0 before the increment */
/* and now has the value -1 */
$redis->decr('key1'); /* -2 */
$redis->decr('key1'); /* -3 */
// Will redirect, and actually make an DECRBY call
$redis->decr('key1', 10); /* -13 */
$redis->decrBy('key1', 10); /* -23 */mGet, getMultiple
Description: Get the values of all the specified keys. If one or more keys don't exist, the array will contain FALSE at the position of the key.
Parameters
Array: Array containing the list of the keys
Return value
Array: Array containing the values related to keys in argument
Examples
$redis->set('key1', 'value1');
$redis->set('key2', 'value2');
$redis->set('key3', 'value3');
$redis->mGet(['key1', 'key2', 'key3']); /* ['value1', 'value2', 'value3'];
$redis->mGet(['key0', 'key1', 'key5']); /* [`FALSE`, 'value1', `FALSE`];Note: getMultiple is an alias for mGet and will be removed in future versions of phpredis.
getSet
Description: Sets a value and returns the previous entry at that key.
Parameters
Key: key
STRING: value
Return value
A string, the previous value located at this key.
Example
$redis->set('x', '42');
$exValue = $redis->getSet('x', 'lol'); // return '42', replaces x by 'lol'
$newValue = $redis->get('x')' // return 'lol'randomKey
Description: Returns a random key.
Parameters
None.
Return value
STRING: an existing key in redis.
Example
$key = $redis->randomKey();
$surprise = $redis->get($key); // who knows what's in there.move
Description: Moves a key to a different database.
Parameters
Key: key, the key to move.
INTEGER: dbindex, the database number to move the key to.
Return value
BOOL: TRUE in case of success, FALSE in case of failure.
Example
$redis->select(0); // switch to DB 0
$redis->set('x', '42'); // write 42 to x
$redis->move('x', 1); // move to DB 1
$redis->select(1); // switch to DB 1
$redis->get('x'); // will return 42rename, renameKey
Description: Renames a key.
Parameters
STRING: srckey, the key to rename.
STRING: dstkey, the new name for the key.
Return value
BOOL: TRUE in case of success, FALSE in case of failure.
Example
$redis->set('x', '42');
$redis->rename('x', 'y');
$redis->get('y'); // → 42
$redis->get('x'); // → `FALSE`Note: renameKey is an alias for rename and will be removed in future versions of phpredis.
renameNx
Description: Same as rename, but will not replace a key if the destination already exists. This is the same behaviour as setNx.
expire, pexpire
Description: Sets an expiration on a key in either seconds or milliseconds.
Prototype
public function expire(string $key, int $seconds, ?string $mode = NULL): Redis|bool;
public function pexpire(string $key, int $milliseconds, ?string $mode = NULL): Redis|bool;Return value
BOOL: TRUE if an expiration was set, and FALSE on failure or if one was not set. You can distinguish between an error and an expiration not being set by checking getLastError().
Example
$redis->set('x', '42');
$redis->expire('x', 3); // x will disappear in 3 seconds.
sleep(5); // wait 5 seconds
$redis->get('x'); // will return `FALSE`, as 'x' has expired.Note: setTimeout is an alias for expire and will be removed in future versions of phpredis.
expireAt, pexpireAt
Description: Seta specific timestamp for a key to expire in seconds or milliseconds.
Prototype
public function expireat(string $key, int $unix_timestamp, ?string $mode = NULL): Redis|bool;
public function pexpireat(string $key, int $unix_timestamp_millis, ?string $mode = NULL): Redis|bool;Return value
BOOL: TRUE if an expiration was set and FALSE if one was not set or in the event on an error. You can detect an actual error by checking getLastError().
Example
$redis->set('x', '42');
$redis->expireAt('x', time(NULL) + 3); // x will disappear in 3 seconds.
sleep(5); // wait 5 seconds
$redis->get('x'); // will return `FALSE`, as 'x' has expired.keys, getKeys
Description: Returns the keys that match a certain pattern.
Parameters
STRING: pattern, using '*' as a wildcard.
Return value
Array of STRING: The keys that match a certain pattern.
Example
$allKeys = $redis->keys('*'); // all keys will match this.
$keyWithUserPrefix = $redis->keys('user*');Note: getKeys is an alias for keys and will be removed in future versions of phpredis.
scan
Description: Scan the keyspace for keys
Parameters
LONG (reference): Iterator, initialized to NULL STRING, Optional: Pattern to match LONG, Optional: Count of keys per iteration (only a suggestion to Redis)
Return value
Array, boolean: This function will return an array of keys or FALSE if Redis returned zero keys
Note: SCAN is a "directed node" command in RedisCluster
Example
/* Without enabling Redis::SCAN_RETRY (default condition) */
$it = NULL;
do {
// Scan for some keys
$arr_keys = $redis->scan($it);
// Redis may return empty results, so protect against that
if ($arr_keys !== FALSE) {
foreach($arr_keys as $str_key) {
echo "Here is a key: $str_key\n";
}
}
} while ($it > 0);
echo "No more keys to scan!\n";
/* With Redis::SCAN_RETRY enabled */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
$it = NULL;
/* phpredis will retry the SCAN command if empty results are returned from the
server, so no empty results check is required. */
while ($arr_keys = $redis->scan($it)) {
foreach ($arr_keys as $str_key) {
echo "Here is a key: $str_key\n";
}
}
echo "No more keys to scan!\n";object
Description: Describes the object pointed to by a key.
Parameters
The information to retrieve (string) and the key (string). Info can be one of the following:
- "encoding"
- "refcount"
- "idletime"
Return value
STRING for "encoding", LONG for "refcount" and "idletime", FALSE if the key doesn't exist.
Example
$redis->object("encoding", "l"); // → ziplist
$redis->object("refcount", "l"); // → 1
$redis->object("idletime", "l"); // → 400 (in seconds, with a precision of 10 seconds).type
Description: Returns the type of data pointed by a given key.
Parameters
Key: key
Return value
Depending on the type of the data pointed by the key, this method will return the following value:
string: Redis::REDIS_STRING
set: Redis::REDIS_SET
list: Redis::REDIS_LIST
zset: Redis::REDIS_ZSET
hash: Redis::REDIS_HASH
other: Redis::REDIS_NOT_FOUND
Example
$redis->type('key');append
Description: Append specified string to the string stored in specified key.
Parameters
Key Value
Return value
INTEGER: Size of the value after the append
Example
$redis->set('key', 'value1');
$redis->append('key', 'value2'); /* 12 */
$redis->get('key'); /* 'value1value2' */getRange
Description: Return a substring of a larger string
Parameters
key
start
end
Return value
STRING: the substring
Example
$redis->set('key', 'string value');
$redis->getRange('key', 0, 5); /* 'string' */
$redis->getRange('key', -5, -1); /* 'value' */Note: substr is an alias for getRange and will be removed in future versions of phpredis.
setRange
Description: Changes a substring of a larger string.
Parameters
key offset value
Return value
STRING: the length of the string after it was modified.
Example
$redis->set('key', 'Hello world');
$redis->setRange('key', 6, "redis"); /* returns 11 */
$redis->get('key'); /* "Hello redis" */strLen
Description: Get the length of a string value.
Parameters
key
Return value
INTEGER
Example
$redis->set('key', 'value');
$redis->strlen('key'); /* 5 */getBit
Description: Return a single bit out of a larger string
Parameters
key
offset
Return value
LONG: the bit value (0 or 1)
Example
$redis->set('key', "\x7f"); // this is 0111 1111
$redis->getBit('key', 0); /* 0 */
$redis->getBit('key', 1); /* 1 */setBit
Description: Changes a single bit of a string.
Parameters
key
offset
value: bool or int (1 or 0)
Return value
LONG: 0 or 1, the value of the bit before it was set.
Example
$redis->set('key', "*"); // ord("*") = 42 = 0x2f = "0010 1010"
$redis->setBit('key', 5, 1); /* returns 0 */
$redis->setBit('key', 7, 1); /* returns 0 */
$redis->get('key'); /* chr(0x2f) = "/" = b("0010 1111") */bitOp
Description: Bitwise operation on multiple keys.
Parameters
operation: either "AND", "OR", "NOT", "XOR"
ret_key: return key
key1
key2...
Return value
LONG: The size of the string stored in the destination key.
bitCount
Description: Count bits in a string.
Parameters
key
Return value
LONG: The number of bits set to 1 in the value behind the input key.
sort
Description: Sort the elements in a list, set or sorted set.
Parameters
Key: key Options: [key => value, ...] - optional, with the following keys and values:
'by' => 'some_pattern_*',
'limit' => [0, 1],
'get' => 'some_other_pattern_*' or an array of patterns,
'sort' => 'asc' or 'desc',
'alpha' => TRUE,
'store' => 'external-key'
Return value
An array of values, or a number corresponding to the number of elements stored if that was used.
Example
$redis->del('s');
$redis->sAdd('s', 5);
$redis->sAdd('s', 4);
$redis->sAdd('s', 2);
$redis->sAdd('s', 1);
$redis->sAdd('s', 3);
var_dump($redis->sort('s')); // 1,2,3,4,5
var_dump($redis->sort('s', ['sort' => 'desc'])); // 5,4,3,2,1
var_dump($redis->sort('s', ['sort' => 'desc', 'store' => 'out'])); // (int)5ttl, pttl
Description: Returns the time to live left for a given key in seconds (ttl), or milliseconds (pttl).
Parameters
Key: key
Return value
LONG: The time to live in seconds. If the key has no ttl, -1 will be returned, and -2 if the key doesn't exist.
Example
$redis->ttl('key');persist
Description: Remove the expiration timer from a key.
Parameters
Key: key
Return value
BOOL: TRUE if a timeout was removed, FALSE if the key didn’t exist or didn’t have an expiration timer.
Example
$redis->persist('key');mSet, mSetNx
Description: Sets multiple key-value pairs in one atomic command. MSETNX only returns TRUE if all the keys were set (see SETNX).
Parameters
Pairs: [key => value, ...]
Return value
Bool TRUE in case of success, FALSE in case of failure.
Example
$redis->mSet(['key0' => 'value0', 'key1' => 'value1']);
var_dump($redis->get('key0'));
var_dump($redis->get('key1'));Output:
string(6) "value0"
string(6) "value1"
dump
Description: Dump a key out of a redis database, the value of which can later be passed into redis using the RESTORE command. The data that comes out of DUMP is a binary representation of the key as Redis stores it.
Parameters
key string
Return value
The Redis encoded value of the key, or FALSE if the key doesn't exist
Examples
$redis->set('foo', 'bar');
$val = $redis->dump('foo'); // $val will be the Redis encoded key valuerestore
Description: Restore a key from the result of a DUMP operation.
Parameters
key string. The key name
ttl integer. How long the key should live (if zero, no expire will be set on the key)
value string (binary). The Redis encoded key value (from DUMP)
Examples
$redis->set('foo', 'bar');
$val = $redis->dump('foo');
$redis->restore('bar', 0, $val); // The key 'bar', will now be equal to the key 'foo'migrate
Description: Migrates a key to a different Redis instance.
Note:: Redis introduced migrating multiple keys in 3.0.6, so you must have at least
that version in order to call migrate with an array of keys.
Parameters
host string. The destination host
port integer. The TCP port to connect to.
key(s) string or array.
destination-db integer. The target DB.
timeout integer. The maximum amount of time given to this transfer.
copy boolean, optional. Should we send the COPY flag to redis.
replace boolean, optional. Should we send the REPLACE flag to redis
Examples
$redis->migrate('backup', 6379, 'foo', 0, 3600);
$redis->migrate('backup', 6379, 'foo', 0, 3600, true, true); /* copy and replace */
$redis->migrate('backup', 6379, 'foo', 0, 3600, false, true); /* just REPLACE flag */
/* Migrate multiple keys (requires Redis >= 3.0.6)
$redis->migrate('backup', 6379, ['key1', 'key2', 'key3'], 0, 3600);Hashes
- hDel - Delete one or more hash fields
- hExists - Determine if a hash field exists
- hGet - Get the value of a hash field
- hGetAll - Get all the fields and values in a hash
- hIncrBy - Increment the integer value of a hash field by the given number
- hIncrByFloat - Increment the float value of a hash field by the given amount
- hKeys - Get all the fields in a hash
- hLen - Get the number of fields in a hash
- hMGet - Get the values of all the given hash fields
- hMSet - Set multiple hash fields to multiple values
- hSet - Set the string value of a hash field
- hSetNx - Set the value of a hash field, only if the field does not exist
- hVals - Get all the values in a hash
- hScan - Scan a hash key for members
- hStrLen - Get the string length of the value associated with field in the hash
hSet
Description: Adds a value to the hash stored at key.
Parameters
key
hashKey
value
Return value
LONG 1 if value didn't exist and was added successfully, 0 if the value was already present and was replaced, FALSE if there was an error.
Example
$redis->del('h')
$redis->hSet('h', 'key1', 'hello'); /* 1, 'key1' => 'hello' in the hash at "h" */
$redis->hGet('h', 'key1'); /* returns "hello" */
$redis->hSet('h', 'key1', 'plop'); /* 0, value was replaced. */
$redis->hGet('h', 'key1'); /* returns "plop" */hSetNx
Description: Adds a value to the hash stored at key only if this field isn't already in the hash.
Return value
BOOL TRUE if the field was set, FALSE if it was already present.
Example
$redis->del('h')
$redis->hSetNx('h', 'key1', 'hello'); /* TRUE, 'key1' => 'hello' in the hash at "h" */
$redis->hSetNx('h', 'key1', 'world'); /* FALSE, 'key1' => 'hello' in the hash at "h". No change since the field wasn't replaced. */hGet
Description: Gets a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.
Parameters
key
hashKey
Return value
STRING The value, if the command executed successfully
BOOL FALSE in case of failure
hLen
Description: Returns the length of a hash, in number of items
Parameters
key
Return value
LONG the number of items in a hash, FALSE if the key doesn't exist or isn't a hash.
Example
$redis->del('h')
$redis->hSet('h', 'key1', 'hello');
$redis->hSet('h', 'key2', 'plop');
$redis->hLen('h'); /* returns 2 */hDel
Description: Removes a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.
Parameters
key
hashKey1
hashKey2
...
Return value
LONG the number of deleted keys, 0 if the key doesn't exist, FALSE if the key isn't a hash.
hKeys
Description: Returns the keys in a hash, as an array of strings.
Parameters
Key: key
Return value
An array of elements, the keys of the hash. This works like PHP's array_keys().
Example
$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hKeys('h'));Output:
array(4) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
}
The order is random and corresponds to redis' own internal representation of the set structure.
hVals
Description: Returns the values in a hash, as an array of strings.
Parameters
Key: key
Return value
An array of elements, the values of the hash. This works like PHP's array_values().
Example
$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hVals('h'));Output:
array(4) {
[0]=>
string(1) "x"
[1]=>
string(1) "y"
[2]=>
string(1) "z"
[3]=>
string(1) "t"
}
The order is random and corresponds to redis' own internal representation of the set structure.
hGetAll
Description: Returns the whole hash, as an array of strings indexed by strings.
Parameters
Key: key
Return value
An array of elements, the contents of the hash.
Example
$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hGetAll('h'));Output:
array(4) {
["a"]=>
string(1) "x"
["b"]=>
string(1) "y"
["c"]=>
string(1) "z"
["d"]=>
string(1) "t"
}
The order is random and corresponds to redis' own internal representation of the set structure.
hExists
Description: Verify if the specified member exists in a key.
Parameters
key
memberKey
Return value
BOOL: If the member exists in the hash table, return TRUE, otherwise return FALSE.
Examples
$redis->hSet('h', 'a', 'x');
$redis->hExists('h', 'a'); /* TRUE */
$redis->hExists('h', 'NonExistingKey'); /* FALSE */hIncrBy
Description: Increments the value of a member from a hash by a given amount.
Parameters
key
member
value: (integer) value that will be added to the member's value
Return value
LONG the new value
Examples
$redis->del('h');
$redis->hIncrBy('h', 'x', 2); /* returns 2: h[x] = 2 now. */
$redis->hIncrBy('h', 'x', 1); /* h[x] ← 2 + 1. Returns 3 */hIncrByFloat
Description: Increments the value of a hash member by the provided float value
Parameters
key
member
value: (float) value that will be added to the member's value
Return value
FLOAT the new value
Examples
$redis->del('h');
$redis->hIncrByFloat('h','x', 1.5); /* returns 1.5: h[x] = 1.5 now */
$redis->hIncrByFloat('h', 'x', 1.5); /* returns 3.0: h[x] = 3.0 now */
$redis->hIncrByFloat('h', 'x', -3.0); /* returns 0.0: h[x] = 0.0 now */hMSet
Description: Fills in a whole hash. Non-string values are converted to string, using the standard (string) cast. NULL values are stored as empty strings.
Parameters
key
members: key → value array
Return value
BOOL
Examples
$redis->del('user:1');
$redis->hMSet('user:1', ['name' => 'Joe', 'salary' => 2000]);
$redis->hIncrBy('user:1', 'salary', 100); // Joe earns 100 more now.hMGet
Description: Retrieve the values associated to the specified fields in the hash.
Parameters
key
memberKeys Array
Return value
Array An array of elements, the values of the specified fields in the hash, with the hash keys as array keys.
Examples
$redis->del('h');
$redis->hSet('h', 'field1', 'value1');
$redis->hSet('h', 'field2', 'value2');
$redis->hMGet('h', ['field1', 'field2']); /* returns ['field1' => 'value1', 'field2' => 'value2'] */hScan
Description: Scan a HASH value for members, with an optional pattern and count
Parameters
key: String
iterator: Long (reference)
pattern: Optional pattern to match against
count: How many keys to return in a go (only a suggestion to Redis)
Return value
Array An array of members that match our pattern
Examples
$it = NULL;
/* Don't ever return an empty array until we're done iterating */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
while($arr_keys = $redis->hScan('hash', $it)) {
foreach($arr_keys as $str_field => $str_value) {
echo "$str_field => $str_value\n"; /* Print the hash member and value */
}
}hStrLen
Description: Get the string length of the value associated with field in the hash stored at key.
Parameters
key: String
field: String
Return value
LONG the string length of the value associated with field, or zero when field is not present in the hash or key does not exist at all.
Lists
- blPop, brPop - Remove and get the first/last element in a list
- bRPopLPush - Pop a value from a list, push it to another list and return it
- lIndex, lGet - Get an element from a list by its index
- lInsert - Insert an element before or after another element in a list
- lLen, lSize - Get the length/size of a list
- lPop - Remove and get the first element in a list
- lPush - Prepend one or multiple values to a list
- lPushx - Prepend a value to a list, only if the list exists
- lRange, lGetRange - Get a range of elements from a list
- lRem, lRemove - Remove elements from a list
- lSet - Set the value of an element in a list by its index
- lTrim, listTrim - Trim a list to the specified range
- rPop - Remove and get the last element in a list
- rPopLPush - Remove the last element in a list, append it to another list and return it (redis >= 1.1)
- rPush - Append one or multiple values to a list
- rPushX - Append a value to a list, only if the list exists
blPop, brPop
Description: Is a blocking lPop(rPop) primitive. If at least one of the lists contains at least one element, the element will be popped from the head of the list and returned to the caller. If all the list identified by the keys passed in arguments are empty, blPop will block during the specified timeout until an element is pushed to one of those lists. This element will be popped.
Parameters
ARRAY Array containing the keys of the lists
INTEGER Timeout
Or
STRING Key1
STRING Key2
STRING Key3
...
STRING Keyn
INTEGER Timeout
Return value
ARRAY ['listName', 'element']
Example
/* Non blocking feature */
$redis->lPush('key1', 'A');
$redis->del('key2');
$redis->blPop('key1', 'key2', 10); /* ['key1', 'A'] */
/* OR */
$redis->blPop(['key1', 'key2'], 10); /* ['key1', 'A'] */
$redis->brPop('key1', 'key2', 10); /* ['key1', 'A'] */
/* OR */
$redis->brPop(['key1', 'key2'], 10); /* ['key1', 'A'] */
/* Blocking feature */
/* process 1 */
$redis->del('key1');
$redis->blPop('key1', 10);
/* blocking for 10 seconds */
/* process 2 */
$redis->lPush('key1', 'A');
/* process 1 */
/* ['key1', 'A'] is returned*/bRPopLPush
Description: A blocking version of rPopLPush, with an integral timeout in the third parameter.
Parameters
Key: srckey
Key: dstkey
Long: timeout
Return value
STRING The element that was moved in case of success, FALSE in case of timeout.
lIndex, lGet
Description: Return the specified element of the list stored at the specified key.
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...
Return FALSE in case of a bad index or a key that doesn't point to a list.
Parameters
key
index
Return value
String the element at this index
Bool FALSE if the key identifies a non-string data type, or no value corresponds to this index in the list Key.
Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lindex('key1', 0); /* 'A' */
$redis->lindex('key1', -1); /* 'C' */
$redis->lindex('key1', 10); /* `FALSE` */Note: lGet is an alias for lIndex and will be removed in future versions of phpredis.
lInsert
Description: Insert value in the list before or after the pivot value.
The parameter options specify the position of the insert (before or after). If the list didn't exists, or the pivot didn't exists, the value is not inserted.
Parameters
key
position Redis::BEFORE | Redis::AFTER
pivot
value
Return value
The number of the elements in the list, -1 if the pivot didn't exists.
Example
$redis->del('key1');
$redis->lInsert('key1', Redis::AFTER, 'A', 'X'); /* 0 */
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');
$redis->lInsert('key1', Redis::BEFORE, 'C', 'X'); /* 4 */
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'X', 'C'] */
$redis->lInsert('key1', Redis::AFTER, 'C', 'Y'); /* 5 */
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'X', 'C', 'Y'] */
$redis->