Class yii\caching\MemCache

继承yii\caching\MemCache » yii\caching\Cache » yii\base\Component » yii\base\BaseObject
实现yii\base\Configurable, yii\caching\CacheInterface
可用自版本2.0
源代码 https://github.com/yiisoft/yii2/blob/master/framework/caching/MemCache.php

MemCache implements a cache application component based on memcache and memcached.

MemCache supports both memcache and memcached. By setting $useMemcached to be true or false, one can let MemCache to use either memcached or memcache, respectively.

MemCache can be configured with a list of memcache servers by settings its $servers property. By default, MemCache assumes there is a memcache server running on localhost at port 11211.

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

Note, there is no security measure to protected data in memcache. All data in memcache can be accessed by any process running in the system.

To use MemCache as the cache application component, configure the application as follows,

[
    'components' => [
        'cache' => [
            'class' => 'yii\caching\MemCache',
            'servers' => [
                [
                    'host' => 'server1',
                    'port' => 11211,
                    'weight' => 60,
                ],
                [
                    'host' => 'server2',
                    'port' => 11211,
                    'weight' => 40,
                ],
            ],
        ],
    ],
]

In the above, two memcache servers are used: server1 and server2. You can configure more properties of each server, such as persistent, weight, timeout. Please see yii\caching\MemCacheServer for available options.

For more details and usage information on Cache, see the guide article on caching.

公共属性

隐藏继承的属性

属性类型描述定义在
$behaviors yii\base\Behavior[] 附加到此组件的行为列表. 该属性是只读的. yii\base\Component
$defaultDuration integer Default duration in seconds before a cache entry will expire. yii\caching\Cache
$keyPrefix string A string prefixed to every cache key so that it is unique globally in the whole cache storage. yii\caching\Cache
$memcache \Memcache|\Memcached The memcache (or memcached) object used by this cache component. This property is read-only. yii\caching\MemCache
$options array Options for Memcached. yii\caching\MemCache
$password string Memcached sasl password. yii\caching\MemCache
$persistentId string An ID that identifies a Memcached instance. yii\caching\MemCache
$serializer null|array|false The functions used to serialize and unserialize cached data. yii\caching\Cache
$servers yii\caching\MemCacheServer[] List of memcache server configurations. Note that the type of this property differs in getter and setter. See getServers() and setServers() for details. yii\caching\MemCache
$useMemcached boolean Whether to use memcached or memcache as the underlying caching extension. yii\caching\MemCache
$username string Memcached sasl username. yii\caching\MemCache

公共方法

隐藏继承的方法

方法描述定义在
__call() 调用不是类方法的指定的方法. yii\base\Component
__clone() 在通过克隆现有对象创建对象之后调用此方法. yii\base\Component
__construct() 构造函数. yii\base\BaseObject
__get() 返回组件属性的值. yii\base\Component
__isset() 检查属性是否已设置, 即已定义且不为null. yii\base\Component
__set() 设置组件属性的值. yii\base\Component
__unset() 将组件属性设置为null. yii\base\Component
add() Stores a value identified by a key into cache if the cache does not contain this key. yii\caching\Cache
attachBehavior() 将行为附加到此组件. yii\base\Component
attachBehaviors() 将行为列表附加到组件. yii\base\Component
behaviors() 返回此组件应该具有的行为列表. yii\base\Component
buildKey() Builds a normalized cache key from a given key. yii\caching\Cache
canGetProperty() 返回一个值, 指示属性是否可读取. yii\base\Component
canSetProperty() 返回一个值, 指示属性是否可设置. yii\base\Component
className() 返回此类的完全限定名称. yii\base\BaseObject
delete() Deletes a value with the specified key from cache. yii\caching\Cache
detachBehavior() 从组件中分离一个行为. yii\base\Component
detachBehaviors() 分离组件中的所有行为. yii\base\Component
ensureBehaviors() 确保在 behaviors() 中声明的行为已附加到此组件. yii\base\Component
exists() Checks whether a specified key exists in the cache. yii\caching\Cache
flush() Deletes all values from cache. yii\caching\Cache
get() Retrieves a value from cache with a specified key. yii\caching\Cache
getBehavior() 返回指定的行为对象. yii\base\Component
getBehaviors() 返回附加到此组件的所有行为. yii\base\Component
getMemcache() Returns the underlying memcache (or memcached) object. yii\caching\MemCache
getOrSet() Method combines both set() and get() methods to retrieve value identified by a $key, or to store the result of $callable execution if there is no cache available for the $key. yii\caching\Cache
getServers() Returns the memcache or memcached server configurations. yii\caching\MemCache
hasEventHandlers() 返回一个值, 指示是否有任何处理程序附加到指定的事件. yii\base\Component
hasMethod() 返回一个值, 指示方法是否已定义. yii\base\Component
hasProperty() 返回一个值, 指示属性是否已定义. yii\base\Component
init() Initializes this application component. yii\caching\MemCache
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() 从该组件分离现有的事件处理程序. 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() 将事件处理程序附加到事件. yii\base\Component
set() Stores a value identified by a key into cache. yii\caching\Cache
setServers() yii\caching\MemCache
trigger() 触发事件. yii\base\Component

受保护的方法

隐藏继承的方法

方法描述定义在
addMemcacheServers() Add servers to the server pool of the cache specified Used for memcache PECL extension. yii\caching\MemCache
addMemcachedServers() Add servers to the server pool of the cache specified Used for memcached PECL extension. yii\caching\MemCache
addServers() Add servers to the server pool of the cache specified. yii\caching\MemCache
addValue() Stores a value identified by a key into cache if the cache does not contain this key. yii\caching\MemCache
addValues() Adds multiple key-value pairs to cache. yii\caching\Cache
deleteValue() Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class. yii\caching\MemCache
flushValues() Deletes all values from cache. yii\caching\MemCache
getValue() Retrieves a value from cache with a specified key. yii\caching\MemCache
getValues() Retrieves multiple values from cache with the specified keys. yii\caching\MemCache
normalizeDuration() Normalizes duration value yii\caching\MemCache
setValue() Stores a value identified by a key in cache. yii\caching\MemCache
setValues() Stores multiple key-value pairs in cache. yii\caching\MemCache

属性详情

$memcache public 属性

The memcache (or memcached) object used by this cache component. This property is read-only.

public \Memcache|\Memcached $memcache null
$options public 属性

Options for Memcached. This property is used only when $useMemcached is true.

参见 https://secure.php.net/manual/en/memcached.setoptions.php.

public array $options null
$password public 属性

Memcached sasl password. This property is used only when $useMemcached is true.

参见 https://secure.php.net/manual/en/memcached.setsaslauthdata.php.

public string $password null
$persistentId public 属性

An ID that identifies a Memcached instance. This property is used only when $useMemcached is true. By default the Memcached instances are destroyed at the end of the request. To create an instance that persists between requests, you may specify a unique ID for the instance. All instances created with the same ID will share the same connection.

参见 https://secure.php.net/manual/en/memcached.construct.php.

public string $persistentId null
$servers public 属性

List of memcache server configurations. Note that the type of this property differs in getter and setter. See getServers() and setServers() for details.

$useMemcached public 属性

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

public boolean $useMemcached false
$username public 属性

Memcached sasl username. This property is used only when $useMemcached is true.

参见 https://secure.php.net/manual/en/memcached.setsaslauthdata.php.

public string $username null

方法详情

addMemcacheServers() protected 方法

Add servers to the server pool of the cache specified Used for memcache PECL extension.

protected void addMemcacheServers ( $cache, $servers )
$cache \Memcache
$servers yii\caching\MemCacheServer[]
addMemcachedServers() protected 方法

Add servers to the server pool of the cache specified Used for memcached PECL extension.

protected void addMemcachedServers ( $cache, $servers )
$cache \Memcached
$servers yii\caching\MemCacheServer[]
addServers() protected 方法

Add servers to the server pool of the cache specified.

protected void addServers ( $cache, $servers )
$cache \Memcache|\Memcached
$servers yii\caching\MemCacheServer[]
throws yii\base\InvalidConfigException
addValue() protected 方法

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.

参见 Memcache::set().

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

The key identifying the value to be cached

$value mixed

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

deleteValue() protected 方法

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

flushValues() protected 方法

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.

getMemcache() public 方法

Returns the underlying memcache (or memcached) object.

public \Memcache|\Memcached getMemcache ( )
return \Memcache|\Memcached

The memcache (or memcached) object used by this cache component.

throws yii\base\InvalidConfigException

if memcache or memcached extension is not loaded

getServers() public 方法

Returns the memcache or memcached server configurations.

public yii\caching\MemCacheServer[] getServers ( )
return yii\caching\MemCacheServer[]

List of memcache server configurations.

getValue() protected 方法

Retrieves a value from cache with a specified key.

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

protected mixed|false getValue ( $key )
$key string

A unique key identifying the cached value

return mixed|false

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

getValues() protected 方法

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 方法

Initializes this application component.

It creates the memcache instance and adds memcache servers.

public void init ( )
normalizeDuration() protected 方法 (可用自版本: 2.0.31)
protected integer normalizeDuration ( $duration )
$duration integer
setServers() public 方法
public void setServers ( $config )
$config array

List of memcache or memcached server configurations. Each element must be an array with the following keys: host, port, persistent, weight, timeout, retryInterval, status.

setValue() protected 方法

Stores a value identified by a key in cache.

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

参见 Memcache::set().

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

The key identifying the value to be cached

$value mixed

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 方法

Stores multiple key-value pairs in cache.

protected array setValues ( $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.