Class Cache

Cache provides a consistent interface to Caching in your application. It allows you to use several different Cache engines, without coupling your application to a specific implementation. It also allows you to change out cache storage or configuration without effecting the rest of your application.

Configuring Cache engines

You can configure Cache engines in your application's Config/cache.php file. A sample configuration would be:

Cache::config('shared', [
   'className' => 'Cake\Cache\Engine\ApcEngine',
   'prefix' => 'my_app_'
]);

This would configure an APC cache engine to the 'shared' alias. You could then read and write to that cache alias by using it for the $config parameter in the various Cache methods.

In general all Cache operations are supported by all cache engines. However, Cache::increment() and Cache::decrement() are not supported by File caching.

There are 5 built-in caching engines:

  • FileEngine - Uses simple files to store content. Poor performance, but good for storing large objects, or things that are not IO sensitive. Well suited to development as it is an easy cache to inspect and manually flush.
  • ApcEngine - Uses the APC object cache, one of the fastest caching engines.
  • MemcacheEngine - Uses the PECL::Memcache extension and Memcached for storage. Fast reads/writes, and benefits from memcache being distributed.
  • XcacheEngine - Uses the Xcache extension, an alternative to APC.
  • WincacheEngine - Uses Windows Cache Extension for PHP. Supports wincache 1.1.0 and higher. This engine is recommended to people deploying on windows with IIS.
  • RedisEngine - Uses redis and php-redis extension to store cache data.

See Cache engine documentation for expected configuration keys.

Cake\Cache\Cache uses Cake\Core\StaticConfigTrait
Namespace: Cake\Cache
See: config/app.php for configuration settings
Param: string $name Name of the configuration
Param: array $config Optional associative array of settings passed to the engine
Return: array
[engine, settings] on success, false on failure
Location: Cache/Cache.php

Properties summary

  • $_dsnClassMap protected static
    array

    An array mapping url schemes to fully qualified caching engine class names.

  • $_enabled protected static
    boolean
    Flag for tracking whether or not caching is enabled.
  • $_groups protected static
    array
    Group to Config mapping
  • $_registry protected static
    Cake\Cache\CacheRegistry
    Cache Registry used for creating and using cache adapters.
  • $_reset protected static
    array
    Whether to reset the settings with the next call to Cache::set();

Inherited Properties

Method Summary

  • _buildEngine() protected static
    Finds and builds the instance of the required engine class.
  • add() public static
    Write data for key into a cache engine if it doesn't exist already.
  • clear() public static
    Delete all keys from the cache.
  • clearAll() public static
    Delete all keys from the cache from all configurations.
  • clearGroup() public static
    Delete all keys from the cache belonging to the same group.
  • decrement() public static
    Decrement a number under the key and return decremented value.
  • delete() public static
    Delete a key from the cache.
  • deleteMany() public static
    Delete many keys from the cache.
  • disable() public static
    Disable caching.
  • enable() public static
    Re-enable caching.
  • enabled() public static
    Check whether or not caching is enabled.
  • engine() public static
    Fetch the engine attached to a specific configuration name.
  • gc() public static
    Garbage collection
  • groupConfigs() public static
    Retrieve group names to config mapping.
  • increment() public static
    Increment a number under the key and return incremented value.
  • read() public static
    Read a key from the cache.
  • readMany() public static
    Read multiple keys from the cache.
  • registry() public static

    Returns the Cache Registry instance used for creating and using cache adapters. Also allows for injecting of a new registry instance.

  • remember() public static
    Provides the ability to easily do read-through caching.
  • write() public static
    Write data for key into cache.
  • writeMany() public static
    Write data for many keys into cache.

Method Detail

_buildEngine()source protected static 

_buildEngine( string $name )

Finds and builds the instance of the required engine class.

Parameters

string $name
Name of the config array that needs an engine instance built

Throws

InvalidArgumentException
When a cache engine cannot be created.

add()source public static 

add( string $key , mixed $value , string $config 'default' )

Write data for key into a cache engine if it doesn't exist already.

Usage:

Writing to the active cache config:

Cache::add('cached_data', $data);

Writing to a specific cache config:

Cache::add('cached_data', $data, 'long_term');

Parameters

string $key
Identifier for the data.
mixed $value
Data to be cached - anything except a resource.
string $config optional 'default'
Optional string configuration name to write to. Defaults to 'default'.

Returns

boolean

True if the data was successfully cached, false on failure. Or if the key existed already.


clear()source public static 

clear( boolean $check false , string $config 'default' )

Delete all keys from the cache.

Parameters

boolean $check optional false
if true will check expiration, otherwise delete all
string $config optional 'default'
name of the configuration to use. Defaults to 'default'

Returns

boolean
True if the cache was successfully cleared, false otherwise

clearAll()source public static 

clearAll( boolean $check false )

Delete all keys from the cache from all configurations.

Parameters

boolean $check optional false
if true will check expiration, otherwise delete all

Returns

array
Status code. For each configuration, it reports the status of the operation

clearGroup()source public static 

clearGroup( string $group , string $config 'default' )

Delete all keys from the cache belonging to the same group.

Parameters

string $group
name of the group to be cleared
string $config optional 'default'
name of the configuration to use. Defaults to 'default'

Returns

boolean
True if the cache group was successfully cleared, false otherwise

decrement()source public static 

decrement( string $key , integer $offset 1 , string $config 'default' )

Decrement a number under the key and return decremented value.

Parameters

string $key
Identifier for the data
integer $offset optional 1
How much to subtract
string $config optional 'default'
Optional string configuration name. Defaults to 'default'

Returns

mixed

new value, or false if the data doesn't exist, is not integer, or if there was an error fetching it


delete()source public static 

delete( string $key , string $config 'default' )

Delete a key from the cache.

Usage:

Deleting from the active cache configuration.

Cache::delete('my_data');

Deleting from a specific cache configuration.

Cache::delete('my_data', 'long_term');

Parameters

string $key
Identifier for the data
string $config optional 'default'
name of the configuration to use. Defaults to 'default'

Returns

boolean
True if the value was successfully deleted, false if it didn't exist or couldn't be removed

deleteMany()source public static 

deleteMany( array $keys , string $config 'default' )

Delete many keys from the cache.

Usage:

Deleting multiple keys from the active cache configuration.

Cache::deleteMany(['my_data_1', 'my_data_2']);

Deleting from a specific cache configuration.

Cache::deleteMany(['my_data_1', 'my_data_2], 'long_term');

Parameters

array $keys
Array of cache keys to be deleted
string $config optional 'default'
name of the configuration to use. Defaults to 'default'

Returns

array

of boolean values that are true if the value was successfully deleted, false if it didn't exist or couldn't be removed


disable()source public static 

disable( )

Disable caching.

When disabled all cache operations will return null.

enable()source public static 

enable( )

Re-enable caching.

If caching has been disabled with Cache::disable() this method will reverse that effect.

enabled()source public static 

enabled( )

Check whether or not caching is enabled.

Returns

boolean

engine()source public static 

engine( string $config )

Fetch the engine attached to a specific configuration name.

If the cache engine & configuration are missing an error will be triggered.

Parameters

string $config
The configuration name you want an engine for.

Returns

Cake\Cache\CacheEngine
When caching is disabled a null engine will be returned.

gc()source public static 

gc( string $config 'default' , integer|null $expires null )

Garbage collection

Permanently remove all expired and deleted data

Parameters

string $config optional 'default'
[optional] The config name you wish to have garbage collected. Defaults to 'default'
integer|null $expires optional null
[optional] An expires timestamp. Defaults to NULL

groupConfigs()source public static 

groupConfigs( string|null $group null )

Retrieve group names to config mapping.

Cache::config('daily', ['duration' => '1 day', 'groups' => ['posts']]);
Cache::config('weekly', ['duration' => '1 week', 'groups' => ['posts', 'archive']]);
$configs = Cache::groupConfigs('posts');

$configs will equal to ['posts' => ['daily', 'weekly']] Calling this method will load all the configured engines.

Parameters

string|null $group optional null
group name or null to retrieve all group mappings

Returns

array
map of group and all configuration that has the same group

Throws

InvalidArgumentException

increment()source public static 

increment( string $key , integer $offset 1 , string $config 'default' )

Increment a number under the key and return incremented value.

Parameters

string $key
Identifier for the data
integer $offset optional 1
How much to add
string $config optional 'default'
Optional string configuration name. Defaults to 'default'

Returns

mixed

new value, or false if the data doesn't exist, is not integer, or if there was an error fetching it.


read()source public static 

read( string $key , string $config 'default' )

Read a key from the cache.

Usage:

Reading from the active cache configuration.

Cache::read('my_data');

Reading from a specific cache configuration.

Cache::read('my_data', 'long_term');

Parameters

string $key
Identifier for the data
string $config optional 'default'
optional name of the configuration to use. Defaults to 'default'

Returns

mixed
The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it

readMany()source public static 

readMany( array $keys , string $config 'default' )

Read multiple keys from the cache.

Usage:

Reading multiple keys from the active cache configuration.

Cache::readMany(['my_data_1', 'my_data_2]);

Reading from a specific cache configuration.

Cache::readMany(['my_data_1', 'my_data_2], 'long_term');

Parameters

array $keys
an array of keys to fetch from the cache
string $config optional 'default'
optional name of the configuration to use. Defaults to 'default'

Returns

array

An array containing, for each of the given $keys, the cached data or false if cached data could not be retrieved.


registry()source public static 

registry( Cake\Core\ObjectRegistry $registry null )

Returns the Cache Registry instance used for creating and using cache adapters. Also allows for injecting of a new registry instance.

Parameters

Cake\Core\ObjectRegistry $registry optional null
Injectable registry object.

Returns

Cake\Core\ObjectRegistry

remember()source public static 

remember( string $key , callable $callable , string $config 'default' )

Provides the ability to easily do read-through caching.

When called if the $key is not set in $config, the $callable function will be invoked. The results will then be stored into the cache config at key.

Examples:

Using a Closure to provide data, assume $this is a Table object:

$results = Cache::remember('all_articles', function () {
     return $this->find('all');
});

Parameters

string $key
The cache key to read/store data at.
callable $callable

The callable that provides data in the case when the cache key is empty. Can be any callable type supported by your PHP.

string $config optional 'default'

The cache configuration to use for this operation. Defaults to default.

Returns

mixed

If the key is found: the cached data, false if the data missing/expired, or an error. If the key is not found: boolean of the success of the write


write()source public static 

write( string $key , mixed $value , string $config 'default' )

Write data for key into cache.

Usage:

Writing to the active cache config:

Cache::write('cached_data', $data);

Writing to a specific cache config:

Cache::write('cached_data', $data, 'long_term');

Parameters

string $key
Identifier for the data
mixed $value
Data to be cached - anything except a resource
string $config optional 'default'
Optional string configuration name to write to. Defaults to 'default'

Returns

boolean
True if the data was successfully cached, false on failure

writeMany()source public static 

writeMany( array $data , string $config 'default' )

Write data for many keys into cache.

Usage:

Writing to the active cache config:

Cache::writeMany(['cached_data_1' => 'data 1', 'cached_data_2' => 'data 2']);

Writing to a specific cache config:

Cache::writeMany(['cached_data_1' => 'data 1', 'cached_data_2' => 'data 2'], 'long_term');

Parameters

array $data
An array of data to be stored in the cache
string $config optional 'default'
Optional string configuration name to write to. Defaults to 'default'

Returns

array
of bools for each key provided, indicating true for success or false for fail

Throws

RuntimeException

Methods used from Cake\Core\StaticConfigTrait

config()source public static 

config( string|array $key , array|null $config null )

This method can be used to define configuration adapters for an application or read existing configuration.

To change an adapter's configuration at runtime, first drop the adapter and then reconfigure it.

Adapters will not be constructed until the first operation is done.

Usage

Assuming that the class' name is Cache the following scenarios are supported:

Reading config data back:

Cache::config('default');

Setting a cache engine up.

Cache::config('default', $settings);

Injecting a constructed adapter in:

Cache::config('default', $instance);

Configure multiple adapters at once:

Cache::config($arrayOfConfig);

Parameters

string|array $key
The name of the configuration, or an array of multiple configs.
array|null $config optional null
An array of name => configuration data for adapter.

Returns

array|null
Null when adding configuration or an array of configuration data when reading.

Throws

BadMethodCallException
When trying to modify an existing config.

configured()source public static 

configured( )

Returns an array containing the named configurations

Returns

array
Array of configurations.

drop()source public static 

drop( string $config )

Drops a constructed adapter.

If you wish to modify an existing configuration, you should drop it, change configuration and then re-add it.

If the implementing objects supports a $_registry object the named configuration will also be unloaded from the registry.

Parameters

string $config
An existing configuration you wish to remove.

Returns

boolean
Success of the removal, returns false when the config does not exist.

dsnClassMap()source public static 

dsnClassMap( array $map null )

Returns or updates the DSN class map for this class

Parameters

array $map optional null
Additions/edits to the class map to apply

Returns

array

parseDsn()source public static 

parseDsn( string $dsn )

Parses a DSN into a valid connection configuration

This method allows setting a DSN using formatting similar to that used by PEAR::DB. The following is an example of its usage:

$dsn = 'mysql://user:pass@localhost/database?';
$config = ConnectionManager::parseDsn($dsn);

$dsn = 'Cake\Log\Engine\FileLog://?types=notice,info,debug&file=debug&path=LOGS';
$config = Log::parseDsn($dsn);

$dsn = 'smtp://user:secret@localhost:25?timeout=30&client=null&tls=null';
$config = Email::parseDsn($dsn);

$dsn = 'file:///?className=\My\Cache\Engine\FileEngine';
$config = Cache::parseDsn($dsn);

$dsn = 'File://?prefix=myapp_cake_core_&serialize=true&duration=+2 minutes&path=/tmp/persistent/';
$config = Cache::parseDsn($dsn);

For all classes, the value of scheme is set as the value of both the className unless they have been otherwise specified.

Note that querystring arguments are also parsed and set as values in the returned configuration.

Parameters

string $dsn
The DSN string to convert to a configuration array

Returns

array
The configuration array to be stored after parsing the DSN

Throws

InvalidArgumentException
If not passed a string

Properties detail

$_dsnClassMapsource

protected static array

An array mapping url schemes to fully qualified caching engine class names.

[
    'apc' => 'Cake\Cache\Engine\ApcEngine',
    'file' => 'Cake\Cache\Engine\FileEngine',
    'memcached' => 'Cake\Cache\Engine\MemcachedEngine',
    'null' => 'Cake\Cache\Engine\NullEngine',
    'redis' => 'Cake\Cache\Engine\RedisEngine',
    'wincache' => 'Cake\Cache\Engine\WincacheEngine',
    'xcache' => 'Cake\Cache\Engine\XcacheEngine',
]

$_enabledsource

protected static boolean

Flag for tracking whether or not caching is enabled.

true

$_groupssource

protected static array

Group to Config mapping

[]

$_registrysource

protected static Cake\Cache\CacheRegistry

Cache Registry used for creating and using cache adapters.

$_resetsource

protected static array

Whether to reset the settings with the next call to Cache::set();

false

© 2005–2017 The Cake Software Foundation, Inc.
Licensed under the MIT License.
CakePHP is a registered trademark of Cake Software Foundation, Inc.
We are not endorsed by or affiliated with CakePHP.
https://api.cakephp.org/3.3/class-Cake.Cache.Cache.html