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Event, yii\base\Event | API Documentation for Yii 2.0

Event is the base class for all event classes.

It encapsulates the parameters associated with an event. The $sender property describes who raises the event. And the $handled property indicates if the event is handled. If an event handler sets $handled to be true, the rest of the uninvoked handlers will no longer be called to handle the event.

Additionally, when attaching an event handler, extra data may be passed and be available via the $data property when the event handler is invoked.

For more details and usage information on Event, see the guide article on events.

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The data that is passed to yii\base\Component::on() when attaching an event handler. Note that this varies according to which event handler is currently executing.

Whether the event is handled. Defaults to false. When a handler sets this to be true, the event processing will stop and ignore the rest of the uninvoked event handlers.

The sender of this event. If not set, this property will be set as the object whose trigger() method is called. This property may also be a null when this event is a class-level event which is triggered in a static context.

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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.

Source code

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

            

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.

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

Source code

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

            

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().

Source code

                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);
}

            

The property name or the event name

Whether the named property is set (not null).

Source code

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

            

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().

Source code

                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);
    }
}

            

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.

Source code

                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);
    }
}

            

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().

Source code

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

            

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().

The property name

Whether to treat member variables as properties

Whether the property can be written

Source code

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

            

Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

Source code

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

            

Returns a value indicating whether there is any handler attached to the specified class-level event.

Note that this method will also check all parent classes to see if there is any handler attached to the named event.

The object or the fully qualified class name specifying the class-level event.

The event name.

Whether there is any handler attached to the event.

Source code

                public static function hasHandlers($class, $name)
{
    if (empty(self::$_eventWildcards) && empty(self::$_events[$name])) {
        return false;
    }
    if (is_object($class)) {
        $class = get_class($class);
    } else {
        $class = ltrim($class, '\\');
    }
    $classes = array_merge(
        [$class],
        class_parents($class, true),
        class_implements($class, true)
    );
    
    foreach ($classes as $className) {
        if (!empty(self::$_events[$name][$className])) {
            return true;
        }
    }
    
    foreach (self::$_eventWildcards as $nameWildcard => $classHandlers) {
        if (!StringHelper::matchWildcard($nameWildcard, $name, ['escape' => false])) {
            continue;
        }
        foreach ($classHandlers as $classWildcard => $handlers) {
            if (empty($handlers)) {
                continue;
            }
            foreach ($classes as $className) {
                if (StringHelper::matchWildcard($classWildcard, $className, ['escape' => false])) {
                    return true;
                }
            }
        }
    }
    return false;
}

            

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().

Source code

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

            

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:

• canGetProperty()
• canSetProperty()

The property name

Whether to treat member variables as properties

Whether the property is defined

Source code

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

            

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.

Source code

                public function init()
{
}

            

Detaches an event handler from a class-level event.

This method is the opposite of on().

Note: in case wildcard pattern is passed for class name or 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().

The fully qualified class name from which the event handler needs to be detached.

The event name.

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

Whether a handler is found and detached.

Source code

                public static function off($class, $name, $handler = null)
{
    $class = ltrim($class, '\\');
    if (empty(self::$_events[$name][$class]) && empty(self::$_eventWildcards[$name][$class])) {
        return false;
    }
    if ($handler === null) {
        unset(self::$_events[$name][$class]);
        unset(self::$_eventWildcards[$name][$class]);
        return true;
    }
    
    if (isset(self::$_events[$name][$class])) {
        $removed = false;
        foreach (self::$_events[$name][$class] as $i => $event) {
            if ($event[0] === $handler) {
                unset(self::$_events[$name][$class][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            self::$_events[$name][$class] = array_values(self::$_events[$name][$class]);
            return true;
        }
    }
    
    $removed = false;
    if (isset(self::$_eventWildcards[$name][$class])) {
        foreach (self::$_eventWildcards[$name][$class] as $i => $event) {
            if ($event[0] === $handler) {
                unset(self::$_eventWildcards[$name][$class][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            self::$_eventWildcards[$name][$class] = array_values(self::$_eventWildcards[$name][$class]);
            
            if (empty(self::$_eventWildcards[$name][$class])) {
                unset(self::$_eventWildcards[$name][$class]);
                if (empty(self::$_eventWildcards[$name])) {
                    unset(self::$_eventWildcards[$name]);
                }
            }
        }
    }
    return $removed;
}

            

Detaches all registered class-level event handlers.

See also:

• on()
• off()

Source code

                public static function offAll()
{
    self::$_events = [];
    self::$_eventWildcards = [];
}

            

Attaches an event handler to a class-level event.

When a class-level event is triggered, event handlers attached to that class and all parent classes will be invoked.

For example, the following code attaches an event handler to ActiveRecord's afterInsert event:

Event::on(ActiveRecord::class, ActiveRecord::EVENT_AFTER_INSERT, function ($event) {
    Yii::trace(get_class($event->sender) . ' is inserted.');
});

The handler will be invoked for EVERY successful ActiveRecord insertion.

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

Event::on('app\models\db\*', '*Insert', function ($event) {
    Yii::trace(get_class($event->sender) . ' is inserted.');
});

For more details about how to declare an event handler, please refer to yii\base\Component::on().

See also off().

The fully qualified class name to which the event handler needs to attach.

The event name.

The event handler.

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.

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.

Source code

                public static function on($class, $name, $handler, $data = null, $append = true)
{
    $class = ltrim($class, '\\');
    if (strpos($class, '*') !== false || strpos($name, '*') !== false) {
        if ($append || empty(self::$_eventWildcards[$name][$class])) {
            self::$_eventWildcards[$name][$class][] = [$handler, $data];
        } else {
            array_unshift(self::$_eventWildcards[$name][$class], [$handler, $data]);
        }
        return;
    }
    if ($append || empty(self::$_events[$name][$class])) {
        self::$_events[$name][$class][] = [$handler, $data];
    } else {
        array_unshift(self::$_events[$name][$class], [$handler, $data]);
    }
}

            

Triggers a class-level event.

This method will cause invocation of event handlers that are attached to the named event for the specified class and all its parent classes.

The object or the fully qualified class name specifying the class-level event.

The event name.

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

Source code

                public static function trigger($class, $name, $event = null)
{
    $wildcardEventHandlers = [];
    foreach (self::$_eventWildcards as $nameWildcard => $classHandlers) {
        if (!StringHelper::matchWildcard($nameWildcard, $name)) {
            continue;
        }
        $wildcardEventHandlers = array_merge($wildcardEventHandlers, $classHandlers);
    }
    if (empty(self::$_events[$name]) && empty($wildcardEventHandlers)) {
        return;
    }
    if ($event === null) {
        $event = new static();
    }
    $event->handled = false;
    $event->name = $name;
    if (is_object($class)) {
        if ($event->sender === null) {
            $event->sender = $class;
        }
        $class = get_class($class);
    } else {
        $class = ltrim($class, '\\');
    }
    $classes = array_merge(
        [$class],
        class_parents($class, true),
        class_implements($class, true)
    );
    foreach ($classes as $class) {
        $eventHandlers = [];
        foreach ($wildcardEventHandlers as $classWildcard => $handlers) {
            if (StringHelper::matchWildcard($classWildcard, $class, ['escape' => false])) {
                $eventHandlers = array_merge($eventHandlers, $handlers);
                unset($wildcardEventHandlers[$classWildcard]);
            }
        }
        if (!empty(self::$_events[$name][$class])) {
            $eventHandlers = array_merge($eventHandlers, self::$_events[$name][$class]);
        }
        foreach ($eventHandlers as $handler) {
            $event->data = $handler[1];
            call_user_func($handler[0], $event);
            if ($event->handled) {
                return;
            }
        }
    }
}

            

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