# Class yii\validators\BooleanValidator

Inheritance | yii\validators\BooleanValidator » yii\validators\Validator » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/validators/BooleanValidator.php

BooleanValidator checks if the attribute value is a boolean value.

Possible boolean values can be configured via the $trueValue and $falseValue properties. And the comparison can be either $strict or not.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$attributeNames | array | Attribute names. | yii\validators\Validator
$attributes | array|string | Attributes to be validated by this validator. | yii\validators\Validator
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. | yii\base\Component
$builtInValidators | array | List of built-in validators (name => class or configuration) | yii\validators\Validator
$enableClientValidation | boolean | Whether to enable client-side validation for this validator. | yii\validators\Validator
$except | array|string | Scenarios that the validator should not be applied to. | yii\validators\Validator
$falseValue | mixed | The value representing false status. | yii\validators\BooleanValidator
$isEmpty | callable|null | A PHP callable that replaces the default implementation of isEmpty(). | yii\validators\Validator
$message | string|null | The user-defined error message. | yii\validators\Validator
$on | array|string | Scenarios that the validator can be applied to. | yii\validators\Validator
$skipOnEmpty | boolean | Whether this validation rule should be skipped if the attribute value is null or an empty string. | yii\validators\Validator
$skipOnError | boolean | Whether this validation rule should be skipped if the attribute being validated already has some validation error according to some previous rules. | yii\validators\Validator
$strict | boolean | Whether the comparison to $trueValue and $falseValue is strict. | yii\validators\BooleanValidator
$trueValue | mixed | The value representing true status. | yii\validators\BooleanValidator
$validationAttributes | array|null | List of attribute names. | yii\validators\Validator
$when | callable|null | A PHP callable whose return value determines whether this validator should be applied. | yii\validators\Validator
$whenClient | string|null | A JavaScript function name whose return value determines whether this validator should be applied on the client-side. | yii\validators\Validator

## Public Methods

Hide inherited methods

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
addError() | Adds an error about the specified attribute to the model object. | yii\validators\Validator
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
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
clientValidateAttribute() | Returns the JavaScript needed for performing client-side validation. | yii\validators\BooleanValidator
createValidator() | Creates a validator object. | yii\validators\Validator
detachBehavior() | Detaches a behavior from the component. | yii\base\Component
detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component
ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component
getAttributeNames() | Returns cleaned attribute names without the `!` character at the beginning. | yii\validators\Validator
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
getClientOptions() | Returns the client-side validation options. | yii\validators\BooleanValidator
getValidationAttributes() | Returns a list of attributes this validator applies to. | yii\validators\Validator
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 object. | yii\validators\BooleanValidator
isActive() | Returns a value indicating whether the validator is active for the given scenario and attribute. | yii\validators\Validator
isEmpty() | Checks if the given value is empty. | yii\validators\Validator
off() | Detaches an existing event handler from this component. | yii\base\Component
on() | Attaches an event handler to an event. | yii\base\Component
trigger() | Triggers an event. | yii\base\Component
validate() | Validates a given value. | yii\validators\Validator
validateAttribute() | Validates a single attribute. | yii\validators\Validator
validateAttributes() | Validates the specified object. | yii\validators\Validator

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
formatMessage() | Formats a mesage using the I18N, or simple strtr if `\Yii::$app` is not available. | yii\validators\Validator
validateValue() | Validates a value. | yii\validators\BooleanValidator

## Property Details

Hide inherited properties

$falseValue public property

The value representing false status. Defaults to '0'.

public mixed $falseValue = '0'
$strict public property

Whether the comparison to $trueValue and $falseValue is strict. When this is true, the attribute value and type must both match those of $trueValue or $falseValue. Defaults to false, meaning only the value needs to be matched.

public boolean $strict = false
$trueValue public property

The value representing true status. Defaults to '1'.

public mixed $trueValue = '1'

## Method Details

Hide inherited methods

__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

Source code

                    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 ( )

Source code

                    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

Source code

                    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.

Source code

                    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

Source code

                    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.

Source code

                    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.

Source code

                    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);
    }

addError() public method

Defined in: yii\validators\Validator::addError()

Adds an error about the specified attribute to the model object.

This is a helper method that performs message selection and internationalization.

public void addError ( $model, $attribute, $message, $params = [] )
$model | yii\base\Model | The data model being validated
$attribute | string | The attribute being validated
$message | string | The error message
$params | array | Values for the placeholders in the error message

Source code

                    public function addError($model, $attribute, $message, $params = [])
    {
        $params['attribute'] = $model->getAttributeLabel($attribute);
        if (!isset($params['value'])) {
            $value = $model->$attribute;
            if (is_array($value)) {
                $params['value'] = 'array()';
            } elseif (is_object($value) && !method_exists($value, '__toString')) {
                $params['value'] = '(object)';
            } else {
                $params['value'] = $value;
            }
        }
        $model->addError($attribute, $this->formatMessage($message, $params));
    }

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:

- a yii\base\Behavior object
- a string specifying the behavior class
- an object configuration array that will be passed to Yii::createObject() to create the behavior object.

return | yii\base\Behavior | The behavior object

Source code

                    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

Source code

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

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.

Source code

                    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

Source code

                    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

Source code

                    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.

Source code

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

clientValidateAttribute() public method

Returns the JavaScript needed for performing client-side validation.

Calls getClientOptions() to generate options array for client-side validation.

You may override this method to return the JavaScript validation code if the validator can support client-side validation.

The following JavaScript variables are predefined and can be used in the validation code:

- `attribute`: an object describing the the attribute being validated.
- `value`: the value being validated.
- `messages`: an array used to hold the validation error messages for the attribute.
- `deferred`: an array used to hold deferred objects for asynchronous validation
- `$form`: a jQuery object containing the form element

The `attribute` object contains the following properties:

- `id`: a unique ID identifying the attribute (e.g. "loginform-username") in the form
- `name`: attribute name or expression (e.g. "[0]content" for tabular input)
- `container`: the jQuery selector of the container of the input field
- `input`: the jQuery selector of the input field under the context of the form
- `error`: the jQuery selector of the error tag under the context of the container
- `status`: status of the input field, 0: empty, not entered before, 1: validated, 2: pending validation, 3: validating

public string|null clientValidateAttribute ( $model, $attribute, $view )
$model | yii\base\Model | The data model being validated
$attribute | string | The name of the attribute to be validated.
$view | yii\web\View | The view object that is going to be used to render views or view files containing a model form with this validator applied.
return | string|null | The client-side validation script. Null if the validator does not support client-side validation.

Source code

                    public function clientValidateAttribute($model, $attribute, $view)
    {
        ValidationAsset::register($view);
        $options = $this->getClientOptions($model, $attribute);
        return 'yii.validation.boolean(value, messages, ' . Json::htmlEncode($options) . ');';
    }

createValidator() public static method

Defined in: yii\validators\Validator::createValidator()

Creates a validator object.

public static yii\validators\Validator createValidator ( $type, $model, $attributes, $params = [] )

$type

string|Closure

The validator type. This can be either:

- a built-in validator name listed in $builtInValidators;
- a method name of the model class;
- an anonymous function;
- a validator class name.

$model | yii\base\Model | The data model to be validated.
$attributes | array|string | List of attributes to be validated. This can be either an array of the attribute names or a string of comma-separated attribute names.
$params | array | Initial values to be applied to the validator properties.
return | yii\validators\Validator | The validator

Source code

                    public static function createValidator($type, $model, $attributes, $params = [])
    {
        $params['attributes'] = $attributes;
        if ($type instanceof \Closure) {
            $params['class'] = __NAMESPACE__ . '\InlineValidator';
            $params['method'] = $type;
        } elseif (!isset(static::$builtInValidators[$type]) && $model->hasMethod($type)) {
            // method-based validator
            $params['class'] = __NAMESPACE__ . '\InlineValidator';
            $params['method'] = [$model, $type];
        } else {
            unset($params['current']);
            if (isset(static::$builtInValidators[$type])) {
                $type = static::$builtInValidators[$type];
            }
            if (is_array($type)) {
                $params = array_merge($type, $params);
            } else {
                $params['class'] = $type;
            }
        }
        return Yii::createObject($params);
    }

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.

Source code

                    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 ( )

Source code

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

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 ( )

Source code

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

formatMessage() protected method (available since version 2.0.12)

Defined in: yii\validators\Validator::formatMessage()

Formats a mesage using the I18N, or simple strtr if `\Yii::$app` is not available.

protected string formatMessage ( $message, $params )
$message | string |
$params | array |

Source code

                    protected function formatMessage($message, $params)
    {
        if (Yii::$app !== null) {
            return \Yii::$app->getI18n()->format($message, $params, Yii::$app->language);
        }
        $placeholders = [];
        foreach ((array) $params as $name => $value) {
            $placeholders['{' . $name . '}'] = $value;
        }
        return ($placeholders === []) ? $message : strtr($message, $placeholders);
    }

getAttributeNames() public method (available since version 2.0.12)

Defined in: yii\validators\Validator::getAttributeNames()

Returns cleaned attribute names without the `!` character at the beginning.

public array getAttributeNames ( )
return | array | Attribute names.

Source code

                    public function getAttributeNames()
    {
        return array_map(function ($attribute) {
            return ltrim($attribute, '!');
        }, $this->attributes);
    }

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

Source code

                    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

Source code

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

getClientOptions() public method (available since version 2.0.11)

Returns the client-side validation options.

This method is usually called from clientValidateAttribute(). You may override this method to modify options that will be passed to the client-side validation.

public array getClientOptions ( $model, $attribute )
$model | yii\base\Model | The model being validated
$attribute | string | The attribute name being validated
return | array | The client-side validation options

Source code

                    public function getClientOptions($model, $attribute)
    {
        $options = [
            'trueValue' => $this->trueValue,
            'falseValue' => $this->falseValue,
            'message' => $this->formatMessage($this->message, [
                'attribute' => $model->getAttributeLabel($attribute),
                'true' => $this->trueValue === true ? 'true' : $this->trueValue,
                'false' => $this->falseValue === false ? 'false' : $this->falseValue,
            ]),
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }
        if ($this->strict) {
            $options['strict'] = 1;
        }
        return $options;
    }

getValidationAttributes() public method (available since version 2.0.16)

Defined in: yii\validators\Validator::getValidationAttributes()

Returns a list of attributes this validator applies to.

public array|null getValidationAttributes ( $attributes = null )

$attributes

array|string|null

The list of attributes to be validated.

- If this is `null`, the result will be equal to getAttributeNames().
- If this is a string or an array, the intersection of getAttributeNames() and the specified attributes will be returned.

return | array|null | List of attribute names.

Source code

                    public function getValidationAttributes($attributes = null)
    {
        if ($attributes === null) {
            return $this->getAttributeNames();
        }
        if (is_scalar($attributes)) {
            $attributes = [$attributes];
        }
        $newAttributes = [];
        $attributeNames = $this->getAttributeNames();
        foreach ($attributes as $attribute) {
            // do not strict compare, otherwise int attributes would fail due to to string conversion in getAttributeNames() using ltrim().
            if (in_array($attribute, $attributeNames, false)) {
                $newAttributes[] = $attribute;
            }
        }
        return $newAttributes;
    }

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.

Source code

                    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

Source code

                    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:

- canGetProperty()
- canSetProperty()

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

Source code

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

init() public method

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 ( )

Source code

                    public function init()
    {
        parent::init();
        if ($this->message === null) {
            $this->message = Yii::t('yii', '{attribute} must be either "{true}" or "{false}".');
        }
    }

isActive() public method

Defined in: yii\validators\Validator::isActive()

Returns a value indicating whether the validator is active for the given scenario and attribute.

A validator is active if

- the validator's `on` property is empty, or
- the validator's `on` property contains the specified scenario

public boolean isActive ( $scenario )
$scenario | string | Scenario name
return | boolean | Whether the validator applies to the specified scenario.

Source code

                    public function isActive($scenario)
    {
        return !in_array($scenario, $this->except, true) && (empty($this->on) || in_array($scenario, $this->on, true));
    }

isEmpty() public method

Defined in: yii\validators\Validator::isEmpty()

Checks if the given value is empty.

A value is considered empty if it is null, an empty array, or an empty string. Note that this method is different from PHP empty(). It will return false when the value is 0.

public boolean isEmpty ( $value )
$value | mixed | The value to be checked
return | boolean | Whether the value is empty

Source code

                    public function isEmpty($value)
    {
        if ($this->isEmpty !== null) {
            return call_user_func($this->isEmpty, $value);
        }
        return $value === null || $value === [] || $value === '';
    }

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

Source code

                    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.

Source code

                    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]);
        }
    }

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.

Source code

                    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);
    }

validate() public method

Defined in: yii\validators\Validator::validate()

Validates a given value.

You may use this method to validate a value out of the context of a data model.

public boolean validate ( $value, &$error = null )
$value | mixed | The data value to be validated.
$error | string|null | The error message to be returned, if the validation fails.
return | boolean | Whether the data is valid.

Source code

                    public function validate($value, &$error = null)
    {
        $result = $this->validateValue($value);
        if (empty($result)) {
            return true;
        }
        list($message, $params) = $result;
        $params['attribute'] = Yii::t('yii', 'the input value');
        if (is_array($value)) {
            $params['value'] = 'array()';
        } elseif (is_object($value)) {
            $params['value'] = 'object';
        } else {
            $params['value'] = $value;
        }
        $error = $this->formatMessage($message, $params);
        return false;
    }

validateAttribute() public method

Defined in: yii\validators\Validator::validateAttribute()

Validates a single attribute.

Child classes must implement this method to provide the actual validation logic.

public void validateAttribute ( $model, $attribute )
$model | yii\base\Model | The data model to be validated
$attribute | string | The name of the attribute to be validated.

Source code

                    public function validateAttribute($model, $attribute)
    {
        $result = $this->validateValue($model->$attribute);
        if (!empty($result)) {
            $this->addError($model, $attribute, $result[0], $result[1]);
        }
    }

validateAttributes() public method

Defined in: yii\validators\Validator::validateAttributes()

Validates the specified object.

public void validateAttributes ( $model, $attributes = null )
$model | yii\base\Model | The data model being validated
$attributes | array|string|null | The list of attributes to be validated. Note that if an attribute is not associated with the validator - it will be ignored. If this parameter is null, every attribute listed in $attributes will be validated.

Source code

                    public function validateAttributes($model, $attributes = null)
    {
        $attributes = $this->getValidationAttributes($attributes);
        foreach ($attributes as $attribute) {
            $skip = $this->skipOnError && $model->hasErrors($attribute)
                || $this->skipOnEmpty && $this->isEmpty($model->$attribute);
            if (!$skip) {
                if ($this->when === null || call_user_func($this->when, $model, $attribute)) {
                    $this->validateAttribute($model, $attribute);
                }
            }
        }
    }

validateValue() protected method

Validates a value.

A validator class can implement this method to support data validation out of the context of a data model.

protected array|null validateValue ( $value )
$value | mixed | The data value to be validated.

return

array|null

The error message and the array of parameters to be inserted into the error message. ```php if (!$valid) {

    return [$this->message, [
        'param1' => $this->param1,
        'formattedLimit' => Yii::$app->formatter->asShortSize($this->getSizeLimit()),
        'mimeTypes' => implode(', ', $this->mimeTypes),
        'param4' => 'etc...',
    ]];

}

return null; ``` for this example `message` template can contain `{param1}`, `{formattedLimit}`, `{mimeTypes}`, `{param4}`

Null should be returned if the data is valid.

throws | yii\base\NotSupportedException | if the validator does not supporting data validation without a model

Source code

                    protected function validateValue($value)
    {
        if ($this->strict) {
            $valid = $value === $this->trueValue || $value === $this->falseValue;
        } else {
            $valid = $value == $this->trueValue || $value == $this->falseValue;
        }
        if (!$valid) {
            return [$this->message, [
                'true' => $this->trueValue === true ? 'true' : $this->trueValue,
                'false' => $this->falseValue === false ? 'false' : $this->falseValue,
            ]];
        }
        return null;
    }