Class yii\caching\ApcCache

Inheritanceyii\caching\ApcCache » yii\caching\Cache » yii\base\Component » yii\base\Object
ImplementsArrayAccess, yii\base\Configurable
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/caching/ApcCache.php

ApcCache provides APC caching in terms of an application component.

To use this application component, the APC PHP extension must be loaded. Alternatively APCu PHP extension could be used via setting useApcu to true. In order to enable APC or APCu for CLI you should add "apc.enable_cli = 1" to your php.ini.

See yii\caching\Cache for common cache operations that ApcCache supports.

Public Properties

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PropertyTypeDescriptionDefined By
$behaviors yii\base\Behavior[] List of behaviors attached to this component yii\base\Component
$keyPrefix string A string prefixed to every cache key so that it is unique globally in the whole cache storage. yii\caching\Cache
$serializer array|boolean The functions used to serialize and unserialize cached data. yii\caching\Cache
$useApcu boolean Whether to use apcu or apc as the underlying caching extension. yii\caching\ApcCache

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. yii\base\Object
__clone() This method is called after the object is created by cloning an existing one. yii\base\Component
__construct() Constructor. yii\base\Object
__get() Returns the value of an object property. yii\base\Object
__isset() Checks if a property is set, i.e. defined and not null. yii\base\Object
__set() Sets value of an object property. yii\base\Object
__unset() Sets an object property to null. yii\base\Object
add() Stores a value identified by a key into cache if the cache does not contain this key. yii\caching\Cache
attachBehavior() Attaches a behavior to this component. yii\base\Component
attachBehaviors() Attaches a list of behaviors to the component. yii\base\Component
behaviors() Returns a list of behaviors that this component should behave as. yii\base\Component
buildKey() Builds a normalized cache key from a given key. yii\caching\Cache
canGetProperty() Returns a value indicating whether a property can be read. yii\base\Object
canSetProperty() Returns a value indicating whether a property can be set. yii\base\Object
className() Returns the fully qualified name of this class. yii\base\Object
delete() Deletes a value with the specified key from cache yii\caching\Cache
detachBehavior() Detaches a behavior from the component. yii\base\Component
detachBehaviors() Detaches all behaviors from the component. yii\base\Component
ensureBehaviors() Makes sure that the behaviors declared in behaviors() are attached to this component. yii\base\Component
exists() Checks whether a specified key exists in the cache. yii\caching\ApcCache
flush() Deletes all values from cache. yii\caching\Cache
get() Retrieves a value from cache with a specified key. yii\caching\Cache
getBehavior() Returns the named behavior object. yii\base\Component
getBehaviors() Returns all behaviors attached to this component. yii\base\Component
hasEventHandlers() Returns a value indicating whether there is any handler attached to the named event. yii\base\Component
hasMethod() Returns a value indicating whether a method is defined. yii\base\Object
hasProperty() Returns a value indicating whether a property is defined. yii\base\Object
init() Initializes this application component. yii\caching\ApcCache
madd() Stores multiple items in cache. Each item contains a value identified by a key. yii\caching\Cache
mget() Retrieves multiple values from cache with the specified keys. yii\caching\Cache
mset() Stores multiple items in cache. Each item contains a value identified by a key. yii\caching\Cache
multiAdd() Stores multiple items in cache. Each item contains a value identified by a key. yii\caching\Cache
multiGet() Retrieves multiple values from cache with the specified keys. yii\caching\Cache
multiSet() Stores multiple items in cache. Each item contains a value identified by a key. yii\caching\Cache
off() Detaches an existing event handler from this component. yii\base\Component
offsetExists() Returns whether there is a cache entry with a specified key. yii\caching\Cache
offsetGet() Retrieves the value from cache with a specified key. yii\caching\Cache
offsetSet() Stores the value identified by a key into cache. yii\caching\Cache
offsetUnset() Deletes the value with the specified key from cache This method is required by the interface ArrayAccess. yii\caching\Cache
on() Attaches an event handler to an event. yii\base\Component
set() Stores a value identified by a key into cache. yii\caching\Cache
trigger() Triggers an event. yii\base\Component

Protected Methods

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MethodDescriptionDefined By
addValue() Stores a value identified by a key into cache if the cache does not contain this key. yii\caching\ApcCache
addValues() Adds multiple key-value pairs to cache. yii\caching\ApcCache
deleteValue() Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class. yii\caching\ApcCache
flushValues() Deletes all values from cache. yii\caching\ApcCache
getValue() Retrieves a value from cache with a specified key. yii\caching\ApcCache
getValues() Retrieves multiple values from cache with the specified keys. yii\caching\ApcCache
setValue() Stores a value identified by a key in cache. yii\caching\ApcCache
setValues() Stores multiple key-value pairs in cache. yii\caching\ApcCache

Property Details

$useApcu public property (available since version 2.0.7)

Whether to use apcu or apc as the underlying caching extension. If true, apcu will be used. If false, apc will be used. Defaults to false.

public boolean $useApcu false

Method Details

addValue() protected method

Stores a value identified by a key into cache if the cache does not contain this key.

This is the implementation of the method declared in the parent class.

protected boolean addValue ( $key, $value, $duration )
$key string

The key identifying the value to be cached

$value string

The value to be cached

$duration integer

The number of seconds in which the cached value will expire. 0 means never expire.

return boolean

True if the value is successfully stored into cache, false otherwise

addValues() protected method

Adds multiple key-value pairs to cache.

protected array addValues ( $data, $duration )
$data array

Array where key corresponds to cache key while value is the value stored

$duration integer

The number of seconds in which the cached values will expire. 0 means never expire.

return array

Array of failed keys

deleteValue() protected method

Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class.

protected boolean deleteValue ( $key )
$key string

The key of the value to be deleted

return boolean

If no error happens during deletion

exists() public method

Checks whether a specified key exists in the cache.

This can be faster than getting the value from the cache if the data is big. Note that this method does not check whether the dependency associated with the cached data, if there is any, has changed. So a call to get() may return false while exists returns true.

public boolean exists ( $key )
$key mixed

A key identifying the cached value. This can be a simple string or a complex data structure consisting of factors representing the key.

return boolean

True if a value exists in cache, false if the value is not in the cache or expired.

flushValues() protected method

Deletes all values from cache.

This is the implementation of the method declared in the parent class.

protected boolean flushValues ( )
return boolean

Whether the flush operation was successful.

getValue() protected method

Retrieves a value from cache with a specified key.

This is the implementation of the method declared in the parent class.

protected string|boolean getValue ( $key )
$key string

A unique key identifying the cached value

return string|boolean

The value stored in cache, false if the value is not in the cache or expired.

getValues() protected method

Retrieves multiple values from cache with the specified keys.

protected array getValues ( $keys )
$keys array

A list of keys identifying the cached values

return array

A list of cached values indexed by the keys

init() public method

Initializes this application component.

It checks if extension required is loaded.

public void init ( )
setValue() protected method

Stores a value identified by a key in cache.

This is the implementation of the method declared in the parent class.

protected boolean setValue ( $key, $value, $duration )
$key string

The key identifying the value to be cached

$value string

The value to be cached

$duration integer

The number of seconds in which the cached value will expire. 0 means never expire.

return boolean

True if the value is successfully stored into cache, false otherwise

setValues() protected method

Stores multiple key-value pairs in cache.

protected array setValues ( $data, $duration )
$data array

Array where key corresponds to cache key while value

$duration integer

The number of seconds in which the cached values will expire. 0 means never expire.

return array

Array of failed keys