Class yii\base\View

Inheritanceyii\base\View » yii\base\Component » yii\base\BaseObject
Implementsyii\base\Configurable, yii\base\DynamicContentAwareInterface
Subclassesluya\admin\ngrest\base\ActiveWindowView, luya\admin\ngrest\render\RenderCrudView, luya\cms\base\PhpBlockView, luya\web\View, yii\web\View
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/base/View.php

View represents a view object in the MVC pattern.

View provides a set of methods (e.g. render()) for rendering purpose.

For more details and usage information on View, see the guide article on views.

Public Properties

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Property Type Description Defined By
$behaviors yii\base\Behavior[] List of behaviors attached to this component. yii\base\Component
$blocks array A list of named output blocks. yii\base\View
$context yii\base\ViewContextInterface The context under which the renderFile() method is being invoked. yii\base\View
$defaultExtension string The default view file extension. yii\base\View
$dynamicContents yii\base\DynamicContentAwareInterface[] Class instances supporting dynamic contents. yii\base\View
$dynamicPlaceholders array A list of placeholders. yii\base\View
$params array Custom parameters that are shared among view templates. yii\base\View
$renderers array|null A list of available renderers indexed by their corresponding supported file extensions. yii\base\View
$theme yii\base\Theme|array|string|null The theme object or the configuration for creating the theme object. yii\base\View
$viewFile string|boolean The view file currently being rendered. yii\base\View

Public Methods

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Method Description Defined By
__call() Calls the named method which is not a class method. yii\base\Component
__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 a component property. yii\base\Component
__isset() Checks if a property is set, i.e. defined and not null. yii\base\Component
__set() Sets the value of a component property. yii\base\Component
__unset() Sets a component property to be null. yii\base\Component
addDynamicPlaceholder() Adds a placeholder for dynamic content. yii\base\View
afterRender() This method is invoked right after renderFile() renders a view file. yii\base\View
attachBehavior() Attaches a behavior to this component. yii\base\Component
attachBehaviors() Attaches a list of behaviors to the component. yii\base\Component
beforeRender() This method is invoked right before renderFile() renders a view file. yii\base\View
beginBlock() Begins recording a block. yii\base\View
beginCache() Begins fragment caching. yii\base\View
beginContent() Begins the rendering of content that is to be decorated by the specified view. yii\base\View
beginPage() Marks the beginning of a page. yii\base\View
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\Component
canSetProperty() Returns a value indicating whether a property can be set. yii\base\Component
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
endBlock() Ends recording a block. yii\base\View
endCache() Ends fragment caching. yii\base\View
endContent() Ends the rendering of content. yii\base\View
endPage() Marks the ending of a page. yii\base\View
ensureBehaviors() Makes sure that the behaviors declared in behaviors() are attached to this component. yii\base\Component
evaluateDynamicContent() Evaluates the given PHP statements. yii\base\View
getBehavior() Returns the named behavior object. yii\base\Component
getBehaviors() Returns all behaviors attached to this component. yii\base\Component
getDynamicContents() Returns a list of currently active dynamic content class instances. yii\base\View
getDynamicPlaceholders() Returns a list of placeholders for dynamic content. This method is used internally to implement the content caching feature. yii\base\View
getViewFile() yii\base\View
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\Component
hasProperty() Returns a value indicating whether a property is defined for this component. yii\base\Component
init() Initializes the view component. yii\base\View
off() Detaches an existing event handler from this component. yii\base\Component
on() Attaches an event handler to an event. yii\base\Component
popDynamicContent() Removes a last class instance supporting dynamic contents from a list of currently active dynamic content class instances. yii\base\View
pushDynamicContent() Adds a class instance supporting dynamic contents to the end of a list of currently active dynamic content class instances. yii\base\View
render() Renders a view. yii\base\View
renderDynamic() Renders dynamic content returned by the given PHP statements. yii\base\View
renderFile() Renders a view file. yii\base\View
renderPhpFile() Renders a view file as a PHP script. yii\base\View
setDynamicPlaceholders() Sets a list of placeholders for dynamic content. This method is used internally to implement the content caching feature. yii\base\View
trigger() Triggers an event. yii\base\Component

Protected Methods

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Method Description Defined By
findViewFile() Finds the view file based on the given view name. yii\base\View
getRequestedViewFile() yii\base\View

Events

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Event Type Description Defined By
EVENT_AFTER_RENDER yii\base\ViewEvent An event that is triggered by renderFile() right after it renders a view file. yii\base\View
EVENT_BEFORE_RENDER yii\base\ViewEvent An event that is triggered by renderFile() right before it renders a view file. yii\base\View
EVENT_BEGIN_PAGE yii\base\Event An event that is triggered by beginPage(). yii\base\View
EVENT_END_PAGE yii\base\Event An event that is triggered by endPage(). yii\base\View

Property Details

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$blocks public property

A list of named output blocks. The keys are the block names and the values are the corresponding block content. You can call beginBlock() and endBlock() to capture small fragments of a view. They can be later accessed somewhere else through this property.

public array $blocks null
$context public property

The context under which the renderFile() method is being invoked.

$defaultExtension public property

The default view file extension. This will be appended to view file names if they don't have file extensions.

public string $defaultExtension 'php'
$dynamicContents public read-only property (available since version 2.0.14)

Class instances supporting dynamic contents.

$dynamicPlaceholders public property

A list of placeholders.

public array getDynamicPlaceholders ( )
public void setDynamicPlaceholders ( $placeholders )
$params public property

Custom parameters that are shared among view templates.

public array $params = []
$renderers public property

A list of available renderers indexed by their corresponding supported file extensions. Each renderer may be a view renderer object or the configuration for creating the renderer object. For example, the following configuration enables both Smarty and Twig view renderers:

[
    'tpl' => ['class' => 'yii\smarty\ViewRenderer'],
    'twig' => ['class' => 'yii\twig\ViewRenderer'],
]

If no renderer is available for the given view file, the view file will be treated as a normal PHP and rendered via renderPhpFile().

public array|null $renderers null
$theme public property

The theme object or the configuration for creating the theme object. If not set, it means theming is not enabled.

$viewFile public property

The view file currently being rendered. False if no view file is being rendered.

public string|boolean $viewFile null

Method Details

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__call() public method

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

Calls the named method which is not a class method.

This method will check if any attached behavior has the named method and will execute it if available.

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)
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $object) {
        if ($object->hasMethod($name)) {
            return call_user_func_array([$object, $name], $params);
        }
    }
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

            
__clone() public method

Defined in: yii\base\Component::__clone()

This method is called after the object is created by cloning an existing one.

It removes all behaviors because they are attached to the old object.

public void __clone ( )

                public function __clone()
{
    $this->_events = [];
    $this->_eventWildcards = [];
    $this->_behaviors = null;
}

            
__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\Component::__get()

Returns the value of a component property.

This method will check in the following order and act accordingly:

  • a property defined by a getter: return the getter result
  • a property of a behavior: return the behavior property value

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

See also __set().

public mixed __get ( $name )
$name string

The property name

return mixed

The property value or the value of a behavior's property

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)) {
        // read property, e.g. getName()
        return $this->$getter();
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name;
        }
    }
    if (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\Component::__isset()

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

This method will check in the following order and act accordingly:

  • a property defined by a setter: return whether the property is set
  • a property of a behavior: return whether the property is set
  • return false for non existing properties

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

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

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name !== null;
        }
    }
    return false;
}

            
__set() public method

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

Sets the value of a component property.

This method will check in the following order and act accordingly:

  • a property defined by a setter: set the property value
  • an event in the format of "on xyz": attach the handler to the event "xyz"
  • a behavior in the format of "as xyz": attach the behavior named as "xyz"
  • a property of a behavior: set the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $component->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)) {
        // set property
        $this->$setter($value);
        return;
    } elseif (strncmp($name, 'on ', 3) === 0) {
        // on event: attach event handler
        $this->on(trim(substr($name, 3)), $value);
        return;
    } elseif (strncmp($name, 'as ', 3) === 0) {
        // as behavior: attach behavior
        $name = trim(substr($name, 3));
        $this->attachBehavior($name, $value instanceof Behavior ? $value : Yii::createObject($value));
        return;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = $value;
            return;
        }
    }
    if (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
}

            
__unset() public method

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

Sets a component property to be null.

This method will check in the following order and act accordingly:

  • a property defined by a setter: set the property value to be null
  • a property of a behavior: set the property value to be null

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

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);
        return;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = null;
            return;
        }
    }
    throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
}

            
addDynamicPlaceholder() public method

Adds a placeholder for dynamic content.

This method is used internally to implement the content caching feature.

public void addDynamicPlaceholder ( $placeholder, $statements )
$placeholder
$statements string

The PHP statements for generating the dynamic content.

                public function addDynamicPlaceholder($placeholder, $statements)
{
    foreach ($this->cacheStack as $cache) {
        if ($cache instanceof DynamicContentAwareInterface) {
            $cache->addDynamicPlaceholder($placeholder, $statements);
        } else {
            // TODO: Remove in 2.1
            $cache->dynamicPlaceholders[$placeholder] = $statements;
        }
    }
    $this->dynamicPlaceholders[$placeholder] = $statements;

            
afterRender() public method

This method is invoked right after renderFile() renders a view file.

The default implementation will trigger the EVENT_AFTER_RENDER event. If you override this method, make sure you call the parent implementation first.

public void afterRender ( $viewFile, $params, &$output )
$viewFile string

The view file being rendered.

$params array

The parameter array passed to the render() method.

$output string

The rendering result of the view file. Updates to this parameter will be passed back and returned by renderFile().

                public function afterRender($viewFile, $params, &$output)
{
    if ($this->hasEventHandlers(self::EVENT_AFTER_RENDER)) {
        $event = new ViewEvent([
            'viewFile' => $viewFile,
            'params' => $params,
        ]);
        $event->output =& $output;
        $this->trigger(self::EVENT_AFTER_RENDER, $event);
    }
}

            
attachBehavior() public method

Defined in: yii\base\Component::attachBehavior()

Attaches a behavior to this component.

This method will create the behavior object based on the given configuration. After that, the behavior object will be attached to this component by calling the yii\base\Behavior::attach() method.

See also detachBehavior().

public yii\base\Behavior attachBehavior ( $name, $behavior )
$name string

The name of the behavior.

$behavior string|array|yii\base\Behavior

The behavior configuration. This can be one of the following:

return yii\base\Behavior

The behavior object

                public function attachBehavior($name, $behavior)
{
    $this->ensureBehaviors();
    return $this->attachBehaviorInternal($name, $behavior);
}

            
attachBehaviors() public method

Defined in: yii\base\Component::attachBehaviors()

Attaches a list of behaviors to the component.

Each behavior is indexed by its name and should be a yii\base\Behavior object, a string specifying the behavior class, or an configuration array for creating the behavior.

See also attachBehavior().

public void attachBehaviors ( $behaviors )
$behaviors array

List of behaviors to be attached to the component

                public function attachBehaviors($behaviors)
{
    $this->ensureBehaviors();
    foreach ($behaviors as $name => $behavior) {
        $this->attachBehaviorInternal($name, $behavior);
    }
}

            
beforeRender() public method

This method is invoked right before renderFile() renders a view file.

The default implementation will trigger the EVENT_BEFORE_RENDER event. If you override this method, make sure you call the parent implementation first.

public boolean beforeRender ( $viewFile, $params )
$viewFile string

The view file to be rendered.

$params array

The parameter array passed to the render() method.

return boolean

Whether to continue rendering the view file.

                public function beforeRender($viewFile, $params)
{
    $event = new ViewEvent([
        'viewFile' => $viewFile,
        'params' => $params,
    ]);
    $this->trigger(self::EVENT_BEFORE_RENDER, $event);
    return $event->isValid;
}

            
beginBlock() public method

Begins recording a block.

This method is a shortcut to beginning yii\widgets\Block.

public yii\widgets\Block beginBlock ( $id, $renderInPlace false )
$id string

The block ID.

$renderInPlace boolean

Whether to render the block content in place. Defaults to false, meaning the captured block will not be displayed.

return yii\widgets\Block

The Block widget instance

                public function beginBlock($id, $renderInPlace = false)
{
    return Block::begin([
        'id' => $id,
        'renderInPlace' => $renderInPlace,
        'view' => $this,
    ]);
}

            
beginCache() public method

Begins fragment caching.

This method will display cached content if it is available. If not, it will start caching and would expect an endCache() call to end the cache and save the content into cache. A typical usage of fragment caching is as follows,

if ($this->beginCache($id)) {
    // ...generate content here
    $this->endCache();
}
public boolean beginCache ( $id, $properties = [] )
$id string

A unique ID identifying the fragment to be cached.

$properties array

Initial property values for yii\widgets\FragmentCache

return boolean

Whether you should generate the content for caching. False if the cached version is available.

                public function beginCache($id, $properties = [])
{
    $properties['id'] = $id;
    $properties['view'] = $this;
    /* @var $cache FragmentCache */
    $cache = FragmentCache::begin($properties);
    if ($cache->getCachedContent() !== false) {
        $this->endCache();
        return false;
    }
    return true;
}

            
beginContent() public method

Begins the rendering of content that is to be decorated by the specified view.

This method can be used to implement nested layout. For example, a layout can be embedded in another layout file specified as '@app/views/layouts/base.php' like the following:

<?php $this->beginContent('@app/views/layouts/base.php'); ?>
//...layout content here...
<?php $this->endContent(); ?>

See also yii\widgets\ContentDecorator.

public yii\widgets\ContentDecorator beginContent ( $viewFile, $params = [] )
$viewFile string

The view file that will be used to decorate the content enclosed by this widget. This can be specified as either the view file path or path alias.

$params array

The variables (name => value) to be extracted and made available in the decorative view.

return yii\widgets\ContentDecorator

The ContentDecorator widget instance

                public function beginContent($viewFile, $params = [])
{
    return ContentDecorator::begin([
        'viewFile' => $viewFile,
        'params' => $params,
        'view' => $this,
    ]);
}

            
beginPage() public method

Marks the beginning of a page.

public void beginPage ( )

                public function beginPage()
{
    ob_start();
    ob_implicit_flush(false);
    $this->trigger(self::EVENT_BEGIN_PAGE);
}

            
behaviors() public method

Defined in: yii\base\Component::behaviors()

Returns a list of behaviors that this component should behave as.

Child classes may override this method to specify the behaviors they want to behave as.

The return value of this method should be an array of behavior objects or configurations indexed by behavior names. A behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName' => [
    'class' => 'BehaviorClass',
    'property1' => 'value1',
    'property2' => 'value2',
]

Note that a behavior class must extend from yii\base\Behavior. Behaviors can be attached using a name or anonymously. When a name is used as the array key, using this name, the behavior can later be retrieved using getBehavior() or be detached using detachBehavior(). Anonymous behaviors can not be retrieved or detached.

Behaviors declared in this method will be attached to the component automatically (on demand).

public array behaviors ( )
return array

The behavior configurations.

                public function behaviors()
{
    return [];
}

            
canGetProperty() public method

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

Returns a value indicating whether a property can be read.

A property can be read 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);
  • an attached behavior has a readable property of the given name (when $checkBehaviors is true).

See also canSetProperty().

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

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property can be read

                public function canGetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canGetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            
canSetProperty() public method

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

Returns a value indicating whether a property can be set.

A property can be written 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);
  • an attached behavior has a writable property of the given name (when $checkBehaviors is true).

See also canGetProperty().

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

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property can be written

                public function canSetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canSetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            
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();
}

            
detachBehavior() public method

Defined in: yii\base\Component::detachBehavior()

Detaches a behavior from the component.

The behavior's yii\base\Behavior::detach() method will be invoked.

public yii\base\Behavior|null detachBehavior ( $name )
$name string

The behavior's name.

return yii\base\Behavior|null

The detached behavior. Null if the behavior does not exist.

                public function detachBehavior($name)
{
    $this->ensureBehaviors();
    if (isset($this->_behaviors[$name])) {
        $behavior = $this->_behaviors[$name];
        unset($this->_behaviors[$name]);
        $behavior->detach();
        return $behavior;
    }
    return null;
}

            
detachBehaviors() public method

Defined in: yii\base\Component::detachBehaviors()

Detaches all behaviors from the component.

public void detachBehaviors ( )

                public function detachBehaviors()
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $name => $behavior) {
        $this->detachBehavior($name);
    }
}

            
endBlock() public method

Ends recording a block.

public void endBlock ( )

                public function endBlock()
{
    Block::end();
}

            
endCache() public method

Ends fragment caching.

public void endCache ( )

                public function endCache()
{
    FragmentCache::end();
}

            
endContent() public method

Ends the rendering of content.

public void endContent ( )

                public function endContent()
{
    ContentDecorator::end();
}

            
endPage() public method

Marks the ending of a page.

public void endPage ( )

                public function endPage()
{
    $this->trigger(self::EVENT_END_PAGE);
    ob_end_flush();
}

            
ensureBehaviors() public method

Defined in: yii\base\Component::ensureBehaviors()

Makes sure that the behaviors declared in behaviors() are attached to this component.

public void ensureBehaviors ( )

                public function ensureBehaviors()
{
    if ($this->_behaviors === null) {
        $this->_behaviors = [];
        foreach ($this->behaviors() as $name => $behavior) {
            $this->attachBehaviorInternal($name, $behavior);
        }
    }
}

            
evaluateDynamicContent() public method

Evaluates the given PHP statements.

This method is mainly used internally to implement dynamic content feature.

public mixed evaluateDynamicContent ( $statements )
$statements string

The PHP statements to be evaluated.

return mixed

The return value of the PHP statements.

                public function evaluateDynamicContent($statements)
{
    return eval($statements);
}

            
findViewFile() protected method

Finds the view file based on the given view name.

protected string findViewFile ( $view, $context null )
$view string

The view name or the path alias of the view file. Please refer to render() on how to specify this parameter.

$context object|null

The context to be assigned to the view and can later be accessed via $context in the view. If the context implements yii\base\ViewContextInterface, it may also be used to locate the view file corresponding to a relative view name.

return string

The view file path. Note that the file may not exist.

throws yii\base\InvalidCallException

if a relative view name is given while there is no active context to determine the corresponding view file.

                protected function findViewFile($view, $context = null)
{
    if (strncmp($view, '@', 1) === 0) {
        // e.g. "@app/views/main"
        $file = Yii::getAlias($view);
    } elseif (strncmp($view, '//', 2) === 0) {
        // e.g. "//layouts/main"
        $file = Yii::$app->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
    } elseif (strncmp($view, '/', 1) === 0) {
        // e.g. "/site/index"
        if (Yii::$app->controller !== null) {
            $file = Yii::$app->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
        } else {
            throw new InvalidCallException("Unable to locate view file for view '$view': no active controller.");
        }
    } elseif ($context instanceof ViewContextInterface) {
        $file = $context->getViewPath() . DIRECTORY_SEPARATOR . $view;
    } elseif (($currentViewFile = $this->getRequestedViewFile()) !== false) {
        $file = dirname($currentViewFile) . DIRECTORY_SEPARATOR . $view;
    } else {
        throw new InvalidCallException("Unable to resolve view file for view '$view': no active view context.");
    }
    if (pathinfo($file, PATHINFO_EXTENSION) !== '') {
        return $file;
    }
    $path = $file . '.' . $this->defaultExtension;
    if ($this->defaultExtension !== 'php' && !is_file($path)) {
        $path = $file . '.php';
    }
    return $path;
}

            
getBehavior() public method

Defined in: yii\base\Component::getBehavior()

Returns the named behavior object.

public yii\base\Behavior|null getBehavior ( $name )
$name string

The behavior name

return yii\base\Behavior|null

The behavior object, or null if the behavior does not exist

                public function getBehavior($name)
{
    $this->ensureBehaviors();
    return isset($this->_behaviors[$name]) ? $this->_behaviors[$name] : null;
}

            
getBehaviors() public method

Defined in: yii\base\Component::getBehaviors()

Returns all behaviors attached to this component.

public yii\base\Behavior[] getBehaviors ( )
return yii\base\Behavior[]

List of behaviors attached to this component

                public function getBehaviors()
{
    $this->ensureBehaviors();
    return $this->_behaviors;
}

            
getDynamicContents() public method (available since version 2.0.14)

Returns a list of currently active dynamic content class instances.

public yii\base\DynamicContentAwareInterface[] getDynamicContents ( )
return yii\base\DynamicContentAwareInterface[]

Class instances supporting dynamic contents.

                public function getDynamicContents()
{
    return $this->cacheStack;
}

            
getDynamicPlaceholders() public method

Returns a list of placeholders for dynamic content. This method is used internally to implement the content caching feature.

public array getDynamicPlaceholders ( )
return array

A list of placeholders.

                public function getDynamicPlaceholders()
{
    return $this->dynamicPlaceholders;
}

            
getRequestedViewFile() protected method (available since version 2.0.16)

protected string|boolean getRequestedViewFile ( )
return string|boolean

The requested view currently being rendered. False if no view file is being rendered.

                protected function getRequestedViewFile()
{
    return empty($this->_viewFiles) ? false : end($this->_viewFiles)['requested'];
}

            
getViewFile() public method

public string|boolean getViewFile ( )
return string|boolean

The view file currently being rendered. False if no view file is being rendered.

                public function getViewFile()
{
    return empty($this->_viewFiles) ? false : end($this->_viewFiles)['resolved'];
}

            
hasEventHandlers() public method

Defined in: yii\base\Component::hasEventHandlers()

Returns a value indicating whether there is any handler attached to the named event.

public boolean hasEventHandlers ( $name )
$name string

The event name

return boolean

Whether there is any handler attached to the event.

                public function hasEventHandlers($name)
{
    $this->ensureBehaviors();
    if (!empty($this->_events[$name])) {
        return true;
    }
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (!empty($handlers) && StringHelper::matchWildcard($wildcard, $name)) {
            return true;
        }
    }
    return Event::hasHandlers($this, $name);
}

            
hasMethod() public method

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

Returns a value indicating whether a method is defined.

A method is defined if:

  • the class has a method with the specified name
  • an attached behavior has a method with the given name (when $checkBehaviors is true).
public boolean hasMethod ( $name, $checkBehaviors true )
$name string

The property name

$checkBehaviors boolean

Whether to treat behaviors' methods as methods of this component

return boolean

Whether the method is defined

                public function hasMethod($name, $checkBehaviors = true)
{
    if (method_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->hasMethod($name)) {
                return true;
            }
        }
    }
    return false;
}

            
hasProperty() public method

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

Returns a value indicating whether a property is defined for this component.

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);
  • an attached behavior has a property of the given name (when $checkBehaviors is true).

See also:

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

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property is defined

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

            
init() public method

Initializes the view component.

public void init ( )

                public function init()
{
    parent::init();
    if (is_array($this->theme)) {
        if (!isset($this->theme['class'])) {
            $this->theme['class'] = 'yii\base\Theme';
        }
        $this->theme = Yii::createObject($this->theme);
    } elseif (is_string($this->theme)) {
        $this->theme = Yii::createObject($this->theme);
    }
}

            
off() public method

Defined in: yii\base\Component::off()

Detaches an existing event handler from this component.

This method is the opposite of on().

Note: in case wildcard pattern is passed for event name, only the handlers registered with this wildcard will be removed, while handlers registered with plain names matching this wildcard will remain.

See also on().

public boolean off ( $name, $handler null )
$name string

Event name

$handler callable|null

The event handler to be removed. If it is null, all handlers attached to the named event will be removed.

return boolean

If a handler is found and detached

                public function off($name, $handler = null)
{
    $this->ensureBehaviors();
    if (empty($this->_events[$name]) && empty($this->_eventWildcards[$name])) {
        return false;
    }
    if ($handler === null) {
        unset($this->_events[$name], $this->_eventWildcards[$name]);
        return true;
    }
    $removed = false;
    // plain event names
    if (isset($this->_events[$name])) {
        foreach ($this->_events[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_events[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_events[$name] = array_values($this->_events[$name]);
            return true;
        }
    }
    // wildcard event names
    if (isset($this->_eventWildcards[$name])) {
        foreach ($this->_eventWildcards[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_eventWildcards[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_eventWildcards[$name] = array_values($this->_eventWildcards[$name]);
            // remove empty wildcards to save future redundant regex checks:
            if (empty($this->_eventWildcards[$name])) {
                unset($this->_eventWildcards[$name]);
            }
        }
    }
    return $removed;
}

            
on() public method

Defined in: yii\base\Component::on()

Attaches an event handler to an event.

The event handler must be a valid PHP callback. The following are some examples:

function ($event) { ... }         // anonymous function
[$object, 'handleClick']          // $object->handleClick()
['Page', 'handleClick']           // Page::handleClick()
'handleClick'                     // global function handleClick()

The event handler must be defined with the following signature,

function ($event)

where $event is an yii\base\Event object which includes parameters associated with the event.

Since 2.0.14 you can specify event name as a wildcard pattern:

$component->on('event.group.*', function ($event) {
    Yii::trace($event->name . ' is triggered.');
});

See also off().

public void on ( $name, $handler, $data null, $append true )
$name string

The event name

$handler callable

The event handler

$data mixed

The data to be passed to the event handler when the event is triggered. When the event handler is invoked, this data can be accessed via yii\base\Event::$data.

$append boolean

Whether to append new event handler to the end of the existing handler list. If false, the new handler will be inserted at the beginning of the existing handler list.

                public function on($name, $handler, $data = null, $append = true)
{
    $this->ensureBehaviors();
    if (strpos($name, '*') !== false) {
        if ($append || empty($this->_eventWildcards[$name])) {
            $this->_eventWildcards[$name][] = [$handler, $data];
        } else {
            array_unshift($this->_eventWildcards[$name], [$handler, $data]);
        }
        return;
    }
    if ($append || empty($this->_events[$name])) {
        $this->_events[$name][] = [$handler, $data];
    } else {
        array_unshift($this->_events[$name], [$handler, $data]);
    }
}

            
popDynamicContent() public method (available since version 2.0.14)

Removes a last class instance supporting dynamic contents from a list of currently active dynamic content class instances.

public void popDynamicContent ( )

                public function popDynamicContent()
{
    array_pop($this->cacheStack);
}

            
pushDynamicContent() public method (available since version 2.0.14)

Adds a class instance supporting dynamic contents to the end of a list of currently active dynamic content class instances.

public void pushDynamicContent ( yii\base\DynamicContentAwareInterface $instance )
$instance yii\base\DynamicContentAwareInterface

Class instance supporting dynamic contents.

                public function pushDynamicContent(DynamicContentAwareInterface $instance)
{
    $this->cacheStack[] = $instance;
}

            
render() public method

Renders a view.

The view to be rendered can be specified in one of the following formats:

  • path alias (e.g. "@app/views/site/index");
  • absolute path within application (e.g. "//site/index"): the view name starts with double slashes. The actual view file will be looked for under the view path of the application.
  • absolute path within current module (e.g. "/site/index"): the view name starts with a single slash. The actual view file will be looked for under the view path of the current module.
  • relative view (e.g. "index"): the view name does not start with @ or /. The corresponding view file will be looked for under the view path of the view $context. If $context is not given, it will be looked for under the directory containing the view currently being rendered (i.e., this happens when rendering a view within another view).

See also renderFile().

public string render ( $view, $params = [], $context null )
$view string

The view name.

$params array

The parameters (name-value pairs) that will be extracted and made available in the view file.

$context object|null

The context to be assigned to the view and can later be accessed via $context in the view. If the context implements yii\base\ViewContextInterface, it may also be used to locate the view file corresponding to a relative view name.

return string

The rendering result

throws yii\base\ViewNotFoundException

if the view file does not exist.

throws yii\base\InvalidCallException

if the view cannot be resolved.

                public function render($view, $params = [], $context = null)
{
    $viewFile = $this->findViewFile($view, $context);
    return $this->renderFile($viewFile, $params, $context);
}

            
renderDynamic() public method

Renders dynamic content returned by the given PHP statements.

This method is mainly used together with content caching (fragment caching and page caching) when some portions of the content (called dynamic content) should not be cached. The dynamic content must be returned by some PHP statements.

See also https://github.com/yiisoft/yii2/issues/17673.

public string renderDynamic ( $statements )
$statements string

The PHP statements for generating the dynamic content.

return string

The placeholder of the dynamic content, or the dynamic content if there is no active content cache currently.

Note that most methods that indirectly modify layout such as registerJS() or registerJSFile() do not work with dynamic rendering.

                public function renderDynamic($statements)
{
    if (!empty($this->cacheStack)) {
        $n = count($this->dynamicPlaceholders);
        $placeholder = "<![CDATA[YII-DYNAMIC-$n]]>";
        $this->addDynamicPlaceholder($placeholder, $statements);
        return $placeholder;
    }
    return $this->evaluateDynamicContent($statements);
}

            
renderFile() public method

Renders a view file.

If $theme is enabled (not null), it will try to render the themed version of the view file as long as it is available.

The method will call yii\helpers\FileHelper::localize() to localize the view file.

If renderer is enabled (not null), the method will use it to render the view file. Otherwise, it will simply include the view file as a normal PHP file, capture its output and return it as a string.

public string renderFile ( $viewFile, $params = [], $context null )
$viewFile string

The view file. This can be either an absolute file path or an alias of it.

$params array

The parameters (name-value pairs) that will be extracted and made available in the view file.

$context object|null

The context that the view should use for rendering the view. If null, existing $context will be used.

return string

The rendering result

throws yii\base\ViewNotFoundException

if the view file does not exist

                public function renderFile($viewFile, $params = [], $context = null)
{
    $viewFile = $requestedFile = Yii::getAlias($viewFile);
    if ($this->theme !== null) {
        $viewFile = $this->theme->applyTo($viewFile);
    }
    if (is_file($viewFile)) {
        $viewFile = FileHelper::localize($viewFile);
    } else {
        throw new ViewNotFoundException("The view file does not exist: $viewFile");
    }
    $oldContext = $this->context;
    if ($context !== null) {
        $this->context = $context;
    }
    $output = '';
    $this->_viewFiles[] = [
        'resolved' => $viewFile,
        'requested' => $requestedFile
    ];
    if ($this->beforeRender($viewFile, $params)) {
        Yii::debug("Rendering view file: $viewFile", __METHOD__);
        $ext = pathinfo($viewFile, PATHINFO_EXTENSION);
        if (isset($this->renderers[$ext])) {
            if (is_array($this->renderers[$ext]) || is_string($this->renderers[$ext])) {
                $this->renderers[$ext] = Yii::createObject($this->renderers[$ext]);
            }
            /* @var $renderer ViewRenderer */
            $renderer = $this->renderers[$ext];
            $output = $renderer->render($this, $viewFile, $params);
        } else {
            $output = $this->renderPhpFile($viewFile, $params);
        }
        $this->afterRender($viewFile, $params, $output);
    }
    array_pop($this->_viewFiles);
    $this->context = $oldContext;
    return $output;
}

            
renderPhpFile() public method

Renders a view file as a PHP script.

This method treats the view file as a PHP script and includes the file. It extracts the given parameters and makes them available in the view file. The method captures the output of the included view file and returns it as a string.

This method should mainly be called by view renderer or renderFile().

public string renderPhpFile ( $_file_, $_params_ = [] )
$_file_ string

The view file.

$_params_ array

The parameters (name-value pairs) that will be extracted and made available in the view file.

return string

The rendering result

throws Throwable

                public function renderPhpFile($_file_, $_params_ = [])
{
    $_obInitialLevel_ = ob_get_level();
    ob_start();
    ob_implicit_flush(false);
    extract($_params_, EXTR_OVERWRITE);
    try {
        require $_file_;
        return ob_get_clean();
    } catch (\Exception $e) {
        while (ob_get_level() > $_obInitialLevel_) {
            if (!@ob_end_clean()) {
                ob_clean();
            }
        }
        throw $e;
    } catch (\Throwable $e) {
        while (ob_get_level() > $_obInitialLevel_) {
            if (!@ob_end_clean()) {
                ob_clean();
            }
        }
        throw $e;
    }
}

            
setDynamicPlaceholders() public method

Sets a list of placeholders for dynamic content. This method is used internally to implement the content caching feature.

public void setDynamicPlaceholders ( $placeholders )
$placeholders array

A list of placeholders.

                public function setDynamicPlaceholders($placeholders)
{
    $this->dynamicPlaceholders = $placeholders;
}

            
trigger() public method

Defined in: yii\base\Component::trigger()

Triggers an event.

This method represents the happening of an event. It invokes all attached handlers for the event including class-level handlers.

public void trigger ( $name, yii\base\Event $event null )
$name string

The event name

$event yii\base\Event|null

The event instance. If not set, a default yii\base\Event object will be created.

                public function trigger($name, Event $event = null)
{
    $this->ensureBehaviors();
    $eventHandlers = [];
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (StringHelper::matchWildcard($wildcard, $name)) {
            $eventHandlers[] = $handlers;
        }
    }
    if (!empty($this->_events[$name])) {
        $eventHandlers[] = $this->_events[$name];
    }
    if (!empty($eventHandlers)) {
        $eventHandlers = call_user_func_array('array_merge', $eventHandlers);
        if ($event === null) {
            $event = new Event();
        }
        if ($event->sender === null) {
            $event->sender = $this;
        }
        $event->handled = false;
        $event->name = $name;
        foreach ($eventHandlers as $handler) {
            $event->data = $handler[1];
            call_user_func($handler[0], $event);
            // stop further handling if the event is handled
            if ($event->handled) {
                return;
            }
        }
    }
    // invoke class-level attached handlers
    Event::trigger($this, $name, $event);
}

            

Event Details

Hide inherited properties

EVENT_AFTER_RENDER event of type yii\base\ViewEvent

An event that is triggered by renderFile() right after it renders a view file.

EVENT_BEFORE_RENDER event of type yii\base\ViewEvent

An event that is triggered by renderFile() right before it renders a view file.

EVENT_BEGIN_PAGE event of type yii\base\Event

An event that is triggered by beginPage().

EVENT_END_PAGE event of type yii\base\Event

An event that is triggered by endPage().