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\ApcuEngine::class,
   'prefix' => 'my_app_'
]);

This would configure an APCu 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 7 built-in caching engines:

  • ApcuEngine - Uses the APCu object cache, one of the fastest caching engines.
  • ArrayEngine - Uses only memory to store all data, not actually a persistent engine. Can be useful in test or CLI environment.
  • 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.
  • MemcacheEngine - Uses the PECL::Memcache extension and Memcached for storage. Fast reads/writes, and benefits from memcache being distributed.
  • RedisEngine - Uses redis and php-redis extension to store cache data.
  • 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.
  • XcacheEngine - Uses the Xcache extension, an alternative to APCu.

See Cache engine documentation for expected configuration keys.

Namespace: Cake\Cache
See: config/app.php for configuration settings

Property Summary

  • $_config protected static
    array<string, mixed>

    Configuration sets.

  • $_dsnClassMap protected static
    array<string, string>

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

  • $_enabled protected static
    bool

    Flag for tracking whether caching is enabled.

  • $_groups protected static
    array<string, array>

    Group to Config mapping

  • $_registry protected static
    Cake\Cache\CacheRegistry|null

    Cache Registry used for creating and using cache adapters.

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.

  • configured() public static

    Returns an array containing the named configurations

  • 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.

  • drop() public static

    Drops a constructed adapter.

  • enable() public static

    Re-enable caching.

  • enabled() public static

    Check whether caching is enabled.

  • engine() public static deprecated

    Get a cache engine object for the named cache config.

  • getConfig() public static

    Reads existing configuration.

  • getConfigOrFail() public static

    Reads existing configuration for a specific key.

  • getDsnClassMap() public static

    Returns the DSN class map for this class.

  • getRegistry() public static

    Returns the Cache Registry instance used for creating and using cache adapters.

  • groupConfigs() public static

    Retrieve group names to config mapping.

  • increment() public static

    Increment a number under the key and return incremented value.

  • parseDsn() public static

    Parses a DSN into a valid connection configuration

  • pool() public static

    Get a SimpleCacheEngine object for the named cache pool.

  • read() public static

    Read a key from the cache.

  • readMany() public static

    Read multiple keys from the cache.

  • remember() public static

    Provides the ability to easily do read-through caching.

  • setConfig() public static

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

  • setDsnClassMap() public static

    Updates the DSN class map for this class.

  • setRegistry() public static

    Sets the Cache Registry instance used for creating and using cache adapters.

  • write() public static

    Write data for key into cache.

  • writeMany() public static

    Write data for many keys into cache.

Method Detail

_buildEngine() protected static 

_buildEngine(string $name): void

Finds and builds the instance of the required engine class.

Parameters

string $name

Name of the config array that needs an engine instance built

Returns

void

Throws

Cake\Cache\InvalidArgumentException
When a cache engine cannot be created.
RuntimeException
If loading of the engine failed.

add() public static 

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

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

Optional string configuration name to write to. Defaults to 'default'.

Returns

bool

clear() public static 

clear(string $config = 'default'): bool

Delete all keys from the cache.

Parameters

string $config optional

name of the configuration to use. Defaults to 'default'

Returns

bool

clearAll() public static 

clearAll(): array<string, bool>

Delete all keys from the cache from all configurations.

Returns

array<string, bool>

clearGroup() public static 

clearGroup(string $group, string $config = 'default'): bool

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

Parameters

string $group

name of the group to be cleared

string $config optional

name of the configuration to use. Defaults to 'default'

Returns

bool

configured() public static 

configured(): array<string>

Returns an array containing the named configurations

Returns

array<string>

decrement() public static 

decrement(string $key, int $offset = 1, string $config = 'default'): int|false

Decrement a number under the key and return decremented value.

Parameters

string $key

Identifier for the data

int $offset optional

How much to subtract

string $config optional

Optional string configuration name. Defaults to 'default'

Returns

int|false

Throws

Cake\Cache\InvalidArgumentException
when offset < 0

delete() public static 

delete(string $key, string $config = 'default'): bool

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

name of the configuration to use. Defaults to 'default'

Returns

bool

deleteMany() public static 

deleteMany(iterable $keys, string $config = 'default'): bool

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

iterable $keys

Array or Traversable of cache keys to be deleted

string $config optional

name of the configuration to use. Defaults to 'default'

Returns

bool

Throws

Cake\Cache\InvalidArgumentException

disable() public static 

disable(): void

Disable caching.

When disabled all cache operations will return null.

Returns

void

drop() public static 

drop(string $config): bool

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

bool

enable() public static 

enable(): void

Re-enable caching.

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

Returns

void

enabled() public static 

enabled(): bool

Check whether caching is enabled.

Returns

bool

engine() public static 

engine(string $config): Psr\SimpleCache\CacheInterfaceCake\Cache\CacheEngineInterface

Get a cache engine object for the named cache config.

Parameters

string $config

The name of the configured cache backend.

Returns

Psr\SimpleCache\CacheInterfaceCake\Cache\CacheEngineInterface

getConfig() public static 

getConfig(string $key): mixed|null

Reads existing configuration.

Parameters

string $key

The name of the configuration.

Returns

mixed|null

getConfigOrFail() public static 

getConfigOrFail(string $key): mixed

Reads existing configuration for a specific key.

The config value for this key must exist, it can never be null.

Parameters

string $key

The name of the configuration.

Returns

mixed

Throws

InvalidArgumentException
If value does not exist.

getDsnClassMap() public static 

getDsnClassMap(): array<string, string>

Returns the DSN class map for this class.

Returns

array<string, string>

getRegistry() public static 

getRegistry(): Cake\Cache\CacheRegistry

Returns the Cache Registry instance used for creating and using cache adapters.

Returns

Cake\Cache\CacheRegistry

groupConfigs() public static 

groupConfigs(string|null $group = null): array<string, array>

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

Group name or null to retrieve all group mappings

Returns

array<string, array>

Throws

Cake\Cache\InvalidArgumentException

increment() public static 

increment(string $key, int $offset = 1, string $config = 'default'): int|false

Increment a number under the key and return incremented value.

Parameters

string $key

Identifier for the data

int $offset optional

How much to add

string $config optional

Optional string configuration name. Defaults to 'default'

Returns

int|false

Throws

Cake\Cache\InvalidArgumentException
When offset < 0

parseDsn() public static 

parseDsn(string $dsn): array<string, mixed>

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<string, mixed>

Throws

InvalidArgumentException
If not passed a string, or passed an invalid string

pool() public static 

pool(string $config): Psr\SimpleCache\CacheInterfaceCake\Cache\CacheEngineInterface

Get a SimpleCacheEngine object for the named cache pool.

Parameters

string $config

The name of the configured cache backend.

Returns

Psr\SimpleCache\CacheInterfaceCake\Cache\CacheEngineInterface

read() public static 

read(string $key, string $config = 'default'): mixed

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

optional name of the configuration to use. Defaults to 'default'

Returns

mixed

readMany() public static 

readMany(iterable $keys, string $config = 'default'): iterable

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

iterable $keys

An array or Traversable of keys to fetch from the cache

string $config optional

optional name of the configuration to use. Defaults to 'default'

Returns

iterable

Throws

Cake\Cache\InvalidArgumentException

remember() public static 

remember(string $key, callable $callable, string $config = 'default'): mixed

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')->toArray();
});

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

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

Returns

mixed

setConfig() public static 

setConfig(array<string, mixed>|string $key, object|array<string, mixed>|null $config = null): void

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

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:

Setting a cache engine up.

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

Injecting a constructed adapter in:

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

Configure multiple adapters at once:

Cache::setConfig($arrayOfConfig);

Parameters

array<string, mixed>|string $key

The name of the configuration, or an array of multiple configs.

object|array<string, mixed>|null $config optional

An array of name => configuration data for adapter.

Returns

void

Throws

BadMethodCallException
When trying to modify an existing config.
LogicException
When trying to store an invalid structured config array.

setDsnClassMap() public static 

setDsnClassMap(array<string, string> $map): void

Updates the DSN class map for this class.

Parameters

array<string, string> $map

Additions/edits to the class map to apply.

Returns

void

setRegistry() public static 

setRegistry(Cake\Cache\CacheRegistry $registry): void

Sets the Cache Registry instance used for creating and using cache adapters.

Also allows for injecting of a new registry instance.

Parameters

Cake\Cache\CacheRegistry $registry

Injectable registry object.

Returns

void

write() public static 

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

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

Optional string configuration name to write to. Defaults to 'default'

Returns

bool

writeMany() public static 

writeMany(iterable $data, string $config = 'default'): bool

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

iterable $data

An array or Traversable of data to be stored in the cache

string $config optional

Optional string configuration name to write to. Defaults to 'default'

Returns

bool

Throws

Cake\Cache\InvalidArgumentException

Property Detail

$_config protected static

Configuration sets.

Type

array<string, mixed>

$_dsnClassMap protected static

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

Type

array<string, string>

$_enabled protected static

Flag for tracking whether caching is enabled.

Type

bool

$_groups protected static

Group to Config mapping

Type

array<string, array>

$_registry protected static

Cache Registry used for creating and using cache adapters.

Type

Cake\Cache\CacheRegistry|null

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