Class yii\widgets\FragmentCache

Inheritanceyii\widgets\FragmentCache » yii\base\Widget » yii\base\Component » yii\base\BaseObject
Implementsyii\base\Configurable, yii\base\ViewContextInterface
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/widgets/FragmentCache.php

FragmentCache is used by yii\base\View to provide caching of page fragments.

Public Properties

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PropertyTypeDescriptionDefined By
$autoIdPrefix string The prefix to the automatically generated widget IDs. yii\base\Widget
$cache yii\caching\CacheInterface|array|string The cache object or the application component ID of the cache object. yii\widgets\FragmentCache
$counter integer A counter used to generate \yii\base\id for widgets. yii\base\Widget
$dependency array|yii\caching\Dependency The dependency that the cached content depends on. yii\widgets\FragmentCache
$duration integer Number of seconds that the data can remain valid in cache. yii\widgets\FragmentCache
$dynamicPlaceholders array A list of placeholders for embedding dynamic contents. yii\widgets\FragmentCache
$enabled boolean Whether to enable the fragment cache. yii\widgets\FragmentCache
$stack yii\base\Widget[] The widgets that are currently being rendered (not ended). yii\base\Widget
$variations array List of factors that would cause the variation of the content being cached. yii\widgets\FragmentCache

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. yii\base\BaseObject
__clone() This method is called after the object is created by cloning an existing one. yii\base\Component
__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() This method is invoked right after a widget is executed. yii\base\Widget
attachBehavior() Attaches a behavior to this component. yii\base\Component
attachBehaviors() Attaches a list of behaviors to the component. yii\base\Component
beforeRun() This method is invoked right before the widget is executed. yii\base\Widget
begin() Begins a widget. yii\base\Widget
behaviors() Returns a list of behaviors that this component should behave as. yii\base\Component
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
detachBehavior() Detaches a behavior from the component. yii\base\Component
detachBehaviors() Detaches all behaviors from the component. yii\base\Component
end() Ends a widget. yii\base\Widget
ensureBehaviors() Makes sure that the behaviors declared in behaviors() are attached to this component. yii\base\Component
getBehavior() Returns the named behavior object. yii\base\Component
getBehaviors() Returns all behaviors attached to this component. yii\base\Component
getCachedContent() Returns the cached content if available. yii\widgets\FragmentCache
getId() Returns the ID of the widget. yii\base\Widget
getView() Returns the view object that can be used to render views or view files. yii\base\Widget
getViewPath() Returns the directory containing the view files for this widget. yii\base\Widget
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\BaseObject
hasProperty() Returns a value indicating whether a property is defined. yii\base\BaseObject
init() Initializes the FragmentCache object. yii\widgets\FragmentCache
off() Detaches an existing event handler from this component. yii\base\Component
on() Attaches an event handler to an event. yii\base\Component
render() Renders a view. yii\base\Widget
renderFile() Renders a view file. yii\base\Widget
run() Marks the end of content to be cached. yii\widgets\FragmentCache
setId() Sets the ID of the widget. yii\base\Widget
setView() Sets the view object to be used by this widget. yii\base\Widget
trigger() Triggers an event. yii\base\Component
widget() Creates a widget instance and runs it. yii\base\Widget

Protected Methods

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MethodDescriptionDefined By
calculateKey() Generates a unique key used for storing the content in cache. yii\widgets\FragmentCache
updateDynamicContent() Replaces placeholders in content by results of evaluated dynamic statements. yii\widgets\FragmentCache

Events

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EventTypeDescriptionDefined By
EVENT_AFTER_RUN yii\base\WidgetEvent An event raised right after executing a widget. (available since version 2.0.11) yii\base\Widget
EVENT_BEFORE_RUN yii\base\WidgetEvent An event raised right before executing a widget. (available since version 2.0.11) yii\base\Widget
EVENT_INIT yii\base\Event An event that is triggered when the widget is initialized via init(). (available since version 2.0.11) yii\base\Widget

Property Details

$cache public property

The cache object or the application component ID of the cache object. After the FragmentCache object is created, if you want to change this property, you should only assign it with a cache object. Starting from version 2.0.2, this can also be a configuration array for creating the object.

$dependency public property

The dependency that the cached content depends on. This can be either a yii\caching\Dependency object or a configuration array for creating the dependency object. For example,

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

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

$duration public property

Number of seconds that the data can remain valid in cache. Use 0 to indicate that the cached data will never expire.

public integer $duration 60
$dynamicPlaceholders public property

A list of placeholders for embedding dynamic contents. This property is used internally to implement the content caching feature. Do not modify it.

$enabled public property

Whether to enable the fragment cache. You may use this property to turn on and off the fragment cache according to specific setting (e.g. enable fragment cache only for GET requests).

public boolean $enabled true
$variations public property

List of factors that would cause the variation of the content being cached. Each factor is a string representing a variation (e.g. the 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 array $variations null

Method Details

calculateKey() protected method

Generates a unique key used for storing the content in cache.

The key generated depends on both \yii\widgets\id and $variations.

protected mixed calculateKey ( )
return mixed

A valid cache key

getCachedContent() public method

Returns the cached content if available.

public string|false getCachedContent ( )
return string|false

The cached content. False is returned if valid content is not found in the cache.

init() public method

Initializes the FragmentCache object.

public void init ( )
run() public method

Marks the end of content to be cached.

Content displayed before this method call and after init() will be captured and saved in cache. This method does nothing if valid content is already found in cache.

public void run ( )
updateDynamicContent() protected method

Replaces placeholders in content by results of evaluated dynamic statements.

protected string updateDynamicContent ( $content, $placeholders )
$content string
$placeholders array
return string

Final content