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ExpressionDependency, yii\caching\ExpressionDependency | API Documentation for Yii 2.0

ExpressionDependency represents a dependency based on the result of a PHP expression.

ExpressionDependency will use eval() to evaluate the PHP expression. The dependency is reported as unchanged if and only if the result of the expression is the same as the one evaluated when storing the data to cache.

A PHP expression can be any PHP code that has a value. To learn more about what an expression is, please refer to the php manual.

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

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The string representation of a PHP expression whose result is used to determine the dependency. A PHP expression can be any PHP code that evaluates to a value. To learn more about what an expression is, please refer to the php manual.

Custom parameters associated with this dependency. You may get the value of this property in $expression using $this->params.

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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();
}

            

Source code

                public function evaluateDependency($cache)
{
    if ($this->reusable) {
        $hash = $this->generateReusableHash();
        if (!array_key_exists($hash, self::$_reusableData)) {
            self::$_reusableData[$hash] = $this->generateDependencyData($cache);
        }
        $this->data = self::$_reusableData[$hash];
    } else {
        $this->data = $this->generateDependencyData($cache);
    }
}

            

Generates the data needed to determine if dependency has been changed.

This method returns the result of the PHP expression.

Source code

                protected function generateDependencyData($cache)
{
    return eval("return {$this->expression};");
}

            

Source code

                protected function generateReusableHash()
{
    $clone = clone $this;
    $clone->data = null; 
    try {
        $serialized = serialize($clone);
    } catch (\Exception $e) {
        
        foreach ($clone as $name => $value) {
            if (is_object($value) && $value instanceof \Closure) {
                $clone->{$name} = null;
            }
        }
        $serialized = serialize($clone);
    }
    return sha1($serialized);
}

            

Source code

                public function getHasChanged($cache)
{
    return $this->isChanged($cache);
}

            

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()
{
}

            

Source code

                public function isChanged($cache)
{
    if ($this->reusable) {
        $hash = $this->generateReusableHash();
        if (!array_key_exists($hash, self::$_reusableData)) {
            self::$_reusableData[$hash] = $this->generateDependencyData($cache);
        }
        $data = self::$_reusableData[$hash];
    } else {
        $data = $this->generateDependencyData($cache);
    }
    return $data !== $this->data;
}

            

Source code

                public static function resetReusableData()
{
    self::$_reusableData = [];
}

            

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