Class yii\behaviors\CacheableWidgetBehavior

All Classes | Properties | Methods
Inheritanceyii\behaviors\CacheableWidgetBehavior » yii\base\Behavior » yii\base\BaseObject
Implementsyii\base\Configurable
Available since version2.0.14
Source Code https://github.com/yiisoft/yii2/blob/master/framework/behaviors/CacheableWidgetBehavior.php

Cacheable widget behavior automatically caches widget contents according to duration and dependencies specified.

The behavior may be used without any configuration if an application has cache component configured. By default the widget will be cached for one minute.

The following example will cache the posts widget for an indefinite duration until any post is modified.

use yii\behaviors\CacheableWidgetBehavior;

public function behaviors()
{
    return [
        [
            'class' => CacheableWidgetBehavior::class,
            'cacheDuration' => 0,
            'cacheDependency' => [
                'class' => 'yii\caching\DbDependency',
                'sql' => 'SELECT MAX(updated_at) FROM posts',
            ],
        ],
    ];
}

Public Properties

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Property Type Description Defined By
$cache yii\caching\CacheInterface|string|array A cache object or a cache component ID or a configuration array for creating a cache object. yii\behaviors\CacheableWidgetBehavior
$cacheDependency yii\caching\Dependency|array|null A cache dependency or a configuration array for creating a cache dependency or null meaning no cache dependency. yii\behaviors\CacheableWidgetBehavior
$cacheDuration integer Cache duration in seconds. yii\behaviors\CacheableWidgetBehavior
$cacheEnabled boolean Whether to enable caching or not. yii\behaviors\CacheableWidgetBehavior
$cacheKeyVariations string[]|string An array of strings or a single string which would cause the variation of the content being cached (e.g. an application language, a GET parameter). yii\behaviors\CacheableWidgetBehavior
$owner yii\base\Component|null The owner of this behavior yii\base\Behavior

Public Methods

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Method Description Defined By
__call() Calls the named method which is not a class method. yii\base\BaseObject
__construct() Constructor. yii\base\BaseObject
__get() Returns the value of an object property. yii\base\BaseObject
__isset() Checks if a property is set, i.e. defined and not null. yii\base\BaseObject
__set() Sets value of an object property. yii\base\BaseObject
__unset() Sets an object property to null. yii\base\BaseObject
afterRun() Outputs widget contents and ends fragment caching. yii\behaviors\CacheableWidgetBehavior
attach() Attaches the behavior object to the component. yii\behaviors\CacheableWidgetBehavior
beforeRun() Begins fragment caching. Prevents owner widget from execution if its contents can be retrieved from the cache. yii\behaviors\CacheableWidgetBehavior
canGetProperty() Returns a value indicating whether a property can be read. yii\base\BaseObject
canSetProperty() Returns a value indicating whether a property can be set. yii\base\BaseObject
className() Returns the fully qualified name of this class. yii\base\BaseObject
detach() Detaches the behavior object from the component. yii\base\Behavior
events() Declares event handlers for the $owner's events. yii\base\Behavior
hasMethod() Returns a value indicating whether a method is defined. yii\base\BaseObject
hasProperty() Returns a value indicating whether a property is defined. yii\base\BaseObject
init() Initializes the object. yii\base\BaseObject

Property Details

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$cache public property

A cache object or a cache component ID or a configuration array for creating a cache object. Defaults to the cache application component.

public yii\caching\CacheInterface|string|array $cache = 'cache'
$cacheDependency public property

A cache dependency or a configuration array for creating a cache dependency or null meaning no cache dependency.

For example,

[
    'class' => 'yii\caching\DbDependency',
    'sql' => 'SELECT MAX(updated_at) FROM posts',
]

would make the widget cache depend on the last modified time of all posts. If any post has its modification time changed, the cached content would be invalidated.

public yii\caching\Dependency|array|null $cacheDependency = null
$cacheDuration public property

Cache duration in seconds. Set to 0 to indicate that the cached data will never expire. Defaults to 60 seconds or 1 minute.

public integer $cacheDuration = 60
$cacheEnabled public property

Whether to enable caching or not. Allows to turn the widget caching on and off according to specific conditions. The following configuration will disable caching when a special GET parameter is passed:

empty(Yii::$app->request->get('disable-caching'))
public boolean $cacheEnabled = true
$cacheKeyVariations public property

An array of strings or a single string which would cause the variation of the content being cached (e.g. an application language, a GET parameter).

The following variation setting will cause the content to be cached in different versions according to the current application language:

[
    Yii::$app->language,
]
public string[]|string $cacheKeyVariations = []

Method Details

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__call() public method

Defined in: yii\base\BaseObject::__call()

Calls the named method which is not a class method.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

public mixed __call ( $name, $params )
$name string

The method name
$params array

Method parameters
return mixed

The method return value
throws yii\base\UnknownMethodException

when calling unknown method

 

                public function __call($name, $params)
{
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}
__construct() public method

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

  • Initializes the object with the given configuration $config.
  • Call init().

If this method is overridden in a child class, it is recommended that

  • the last parameter of the constructor is a configuration array, like $config here.
  • call the parent implementation at the end of the constructor.
public void __construct ( $config = [] )
$config array

Name-value pairs that will be used to initialize the object properties

 

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}
__get() public method

Defined in: yii\base\BaseObject::__get()

Returns the value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $object->property;.

See also __set().

public mixed __get ( $name )
$name string

The property name
return mixed

The property value
throws yii\base\UnknownPropertyException

if the property is not defined
throws yii\base\InvalidCallException

if the property is write-only

 

                public function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter();
    } elseif (method_exists($this, 'set' . $name)) {
        throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
}
__isset() public method

Defined in: yii\base\BaseObject::__isset()

Checks if a property is set, i.e. defined and not null.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing isset($object->property).

Note that if the property is not defined, false will be returned.

See also https://www.php.net/manual/en/function.isset.php.

public boolean __isset ( $name )
$name string

The property name or the event name
return boolean

Whether the named property is set (not null).

 

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    return false;
}
__set() public method

Defined in: yii\base\BaseObject::__set()

Sets value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $object->property = $value;.

See also __get().

public void __set ( $name, $value )
$name string

The property name or the event name
$value mixed

The property value
throws yii\base\UnknownPropertyException

if the property is not defined
throws yii\base\InvalidCallException

if the property is read-only

 

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter($value);
    } elseif (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    } else {
        throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
    }
}
__unset() public method

Defined in: yii\base\BaseObject::__unset()

Sets an object property to null.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($object->property).

Note that if the property is not defined, this method will do nothing. If the property is read-only, it will throw an exception.

See also https://www.php.net/manual/en/function.unset.php.

public void __unset ( $name )
$name string

The property name
throws yii\base\InvalidCallException

if the property is read only.

 

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
    } elseif (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Unsetting read-only property: ' . get_class($this) . '::' . $name);
    }
}
afterRun() public method

Outputs widget contents and ends fragment caching.

public void afterRun ( $event )
$event yii\base\WidgetEvent

Widget::EVENT_AFTER_RUN event.

 

                public function afterRun($event)
{
    echo $event->result;
    $event->result = null;
    $this->owner->view->endCache();
}
attach() public method

Attaches the behavior object to the component.

The default implementation will set the $owner property and attach event handlers as declared in events(). Make sure you call the parent implementation if you override this method.

public void attach ( $owner )
$owner yii\base\Component

The component that this behavior is to be attached to.

 

                public function attach($owner)
{
    parent::attach($owner);
    $this->initializeEventHandlers();
}
beforeRun() public method

Begins fragment caching. Prevents owner widget from execution if its contents can be retrieved from the cache.

public void beforeRun ( $event )
$event yii\base\WidgetEvent

Widget::EVENT_BEFORE_RUN event.

 

                public function beforeRun($event)
{
    $cacheKey = $this->getCacheKey();
    $fragmentCacheConfiguration = $this->getFragmentCacheConfiguration();
    if (!$this->owner->view->beginCache($cacheKey, $fragmentCacheConfiguration)) {
        $event->isValid = false;
    }
}
canGetProperty() public method

Defined in: yii\base\BaseObject::canGetProperty()

Returns a value indicating whether a property can be read.

A property is readable if:

  • the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);

See also canSetProperty().

public boolean canGetProperty ( $name, $checkVars = true )
$name string

The property name
$checkVars boolean

Whether to treat member variables as properties
return boolean

Whether the property can be read

 

                public function canGetProperty($name, $checkVars = true)
{
    return method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name);
}
canSetProperty() public method

Defined in: yii\base\BaseObject::canSetProperty()

Returns a value indicating whether a property can be set.

A property is writable if:

  • the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);

See also canGetProperty().

public boolean canSetProperty ( $name, $checkVars = true )
$name string

The property name
$checkVars boolean

Whether to treat member variables as properties
return boolean

Whether the property can be written

 

                public function canSetProperty($name, $checkVars = true)
{
    return method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name);
}
className() public static method
Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

Defined in: yii\base\BaseObject::className()

Returns the fully qualified name of this class.

public static string className ( )
return string

The fully qualified name of this class.

 

                public static function className()
{
    return get_called_class();
}
detach() public method

Defined in: yii\base\Behavior::detach()

Detaches the behavior object from the component.

The default implementation will unset the $owner property and detach event handlers declared in events(). Make sure you call the parent implementation if you override this method.

public void detach ( )

                public function detach()
{
    if ($this->owner) {
        foreach ($this->_attachedEvents as $event => $handler) {
            $this->owner->off($event, is_string($handler) ? [$this, $handler] : $handler);
        }
        $this->_attachedEvents = [];
        $this->owner = null;
    }
}
events() public method

Defined in: yii\base\Behavior::events()

Declares event handlers for the $owner's events.

Child classes may override this method to declare what PHP callbacks should be attached to the events of the $owner component.

The callbacks will be attached to the $owner's events when the behavior is attached to the owner; and they will be detached from the events when the behavior is detached from the component.

The callbacks can be any of the following:

  • method in this behavior: 'handleClick', equivalent to [$this, 'handleClick']
  • object method: [$object, 'handleClick']
  • static method: ['Page', 'handleClick']
  • anonymous function: function ($event) { ... }

The following is an example:

[
    Model::EVENT_BEFORE_VALIDATE => 'myBeforeValidate',
    Model::EVENT_AFTER_VALIDATE => 'myAfterValidate',
]
public array events ( )
return array

Events (array keys) and the corresponding event handler methods (array values).

 

                public function events()
{
    return [];
}
hasMethod() public method

Defined in: yii\base\BaseObject::hasMethod()

Returns a value indicating whether a method is defined.

The default implementation is a call to php function method_exists(). You may override this method when you implemented the php magic method __call().

public boolean hasMethod ( $name )
$name string

The method name
return boolean

Whether the method is defined

 

                public function hasMethod($name)
{
    return method_exists($this, $name);
}
hasProperty() public method

Defined in: yii\base\BaseObject::hasProperty()

Returns a value indicating whether a property is defined.

A property is defined if:

  • the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);

See also:

public boolean hasProperty ( $name, $checkVars = true )
$name string

The property name
$checkVars boolean

Whether to treat member variables as properties
return boolean

Whether the property is defined

 

                public function hasProperty($name, $checkVars = true)
{
    return $this->canGetProperty($name, $checkVars) || $this->canSetProperty($name, false);
}
init() public method

Defined in: yii\base\BaseObject::init()

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

public void init ( )

                public function init()
{
}