Class yii\validators\Validator

Inheritance	yii\validators\Validator » yii\base\Component » yii\base\Object
Implements	yii\base\Configurable
Subclasses	yii\captcha\CaptchaValidator, yii\mongodb\validators\MongoDateValidator, yii\mongodb\validators\MongoIdValidator, yii\validators\BooleanValidator, yii\validators\CompareValidator, yii\validators\DateValidator, yii\validators\DefaultValueValidator, yii\validators\EachValidator, yii\validators\EmailValidator, yii\validators\ExistValidator, yii\validators\FileValidator, yii\validators\FilterValidator, yii\validators\ImageValidator, yii\validators\InlineValidator, yii\validators\IpValidator, yii\validators\NumberValidator, yii\validators\RangeValidator, yii\validators\RegularExpressionValidator, yii\validators\RequiredValidator, yii\validators\SafeValidator, yii\validators\StringValidator, yii\validators\UniqueValidator, yii\validators\UrlValidator
Available since version	2.0
Source Code	https://github.com/yiisoft/yii2/blob/master/framework/validators/Validator.php

Validator is the base class for all validators.

Child classes should override the validateValue() and/or validateAttribute() methods to provide the actual logic of performing data validation. Child classes may also override clientValidateAttribute() to provide client-side validation support.

Validator declares a set of built-in validators which can be referenced using short names. They are listed as follows:

• boolean: yii\validators\BooleanValidator
• captcha: yii\captcha\CaptchaValidator
• compare: yii\validators\CompareValidator
• date: yii\validators\DateValidator
• datetime: yii\validators\DateValidator
• time: yii\validators\DateValidator
• default: yii\validators\DefaultValueValidator
• double: yii\validators\NumberValidator
• each: yii\validators\EachValidator
• email: yii\validators\EmailValidator
• exist: yii\validators\ExistValidator
• file: yii\validators\FileValidator
• filter: yii\validators\FilterValidator
• image: yii\validators\ImageValidator
• in: yii\validators\RangeValidator
• integer: yii\validators\NumberValidator
• match: yii\validators\RegularExpressionValidator
• required: yii\validators\RequiredValidator
• safe: yii\validators\SafeValidator
• string: yii\validators\StringValidator
• trim: yii\validators\FilterValidator
• unique: yii\validators\UniqueValidator
• url: yii\validators\UrlValidator
• ip: yii\validators\IpValidator

For more details and usage information on Validator, see the guide article on validators.

Public 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
$isEmpty	callable	A PHP callable that replaces the default implementation of isEmpty().	yii\validators\Validator
$message	string	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
$when	callable	A PHP callable whose return value determines whether this validator should be applied.	yii\validators\Validator
$whenClient	string	A JavaScript function name whose return value determines whether this validator should be applied on the client-side.	yii\validators\Validator

Public 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\Object
__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\Object
clientValidateAttribute()	Returns the JavaScript needed for performing client-side validation.	yii\validators\Validator
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\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\Validator
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

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\Validator

Property Details

$attributeNames public read-only property

Attribute names.

public array getAttributeNames ( )

$attributes public property

Attributes to be validated by this validator. For multiple attributes, please specify them as an array; for single attribute, you may use either a string or an array.

public array|string $attributes = []

$builtInValidators public static property

List of built-in validators (name => class or configuration)

public static array $builtInValidators = ['boolean' => 'yii\validators\BooleanValidator', 'captcha' => 'yii\captcha\CaptchaValidator', 'compare' => 'yii\validators\CompareValidator', 'date' => 'yii\validators\DateValidator', 'datetime' => ['class' => 'yii\validators\DateValidator', 'type' => \yii\validators\DateValidator::TYPE_DATETIME], 'time' => ['class' => 'yii\validators\DateValidator', 'type' => \yii\validators\DateValidator::TYPE_TIME], 'default' => 'yii\validators\DefaultValueValidator', 'double' => 'yii\validators\NumberValidator', 'each' => 'yii\validators\EachValidator', 'email' => 'yii\validators\EmailValidator', 'exist' => 'yii\validators\ExistValidator', 'file' => 'yii\validators\FileValidator', 'filter' => 'yii\validators\FilterValidator', 'image' => 'yii\validators\ImageValidator', 'in' => 'yii\validators\RangeValidator', 'integer' => ['class' => 'yii\validators\NumberValidator', 'integerOnly' => true], 'match' => 'yii\validators\RegularExpressionValidator', 'number' => 'yii\validators\NumberValidator', 'required' => 'yii\validators\RequiredValidator', 'safe' => 'yii\validators\SafeValidator', 'string' => 'yii\validators\StringValidator', 'trim' => ['class' => 'yii\validators\FilterValidator', 'filter' => 'trim', 'skipOnArray' => true], 'unique' => 'yii\validators\UniqueValidator', 'url' => 'yii\validators\UrlValidator', 'ip' => 'yii\validators\IpValidator']

$enableClientValidation public property

Whether to enable client-side validation for this validator. The actual client-side validation is done via the JavaScript code returned by clientValidateAttribute(). If that method returns null, even if this property is true, no client-side validation will be done by this validator.

public boolean $enableClientValidation = true

$except public property

Scenarios that the validator should not be applied to. For multiple scenarios, please specify them as an array; for single scenario, you may use either a string or an array.

public array|string $except = []

$isEmpty public property

A PHP callable that replaces the default implementation of isEmpty(). If not set, isEmpty() will be used to check if a value is empty. The signature of the callable should be function ($value) which returns a boolean indicating whether the value is empty.

public callable $isEmpty = null

$message public property

The user-defined error message. It may contain the following placeholders which will be replaced accordingly by the validator:

• {attribute}: the label of the attribute being validated
• {value}: the value of the attribute being validated

Note that some validators may introduce other properties for error messages used when specific validation conditions are not met. Please refer to individual class API documentation for details about these properties. By convention, this property represents the primary error message used when the most important validation condition is not met.

public string $message = null

$on public property

Scenarios that the validator can be applied to. For multiple scenarios, please specify them as an array; for single scenario, you may use either a string or an array.

public array|string $on = []

$skipOnEmpty public property

Whether this validation rule should be skipped if the attribute value is null or an empty string.

public boolean $skipOnEmpty = true

$skipOnError public property

Whether this validation rule should be skipped if the attribute being validated already has some validation error according to some previous rules. Defaults to true.

public boolean $skipOnError = true

$when public property

A PHP callable whose return value determines whether this validator should be applied. The signature of the callable should be function ($model, $attribute), where $model and $attribute refer to the model and the attribute currently being validated. The callable should return a boolean value.

This property is mainly provided to support conditional validation on the server-side. If this property is not set, this validator will be always applied on the server-side.

The following example will enable the validator only when the country currently selected is USA:

function ($model) {
    return $model->country == Country::USA;
}

See also $whenClient.

public callable $when = null

$whenClient public property

A JavaScript function name whose return value determines whether this validator should be applied on the client-side. The signature of the function should be function (attribute, value), where attribute is an object describing the attribute being validated (see clientValidateAttribute()) and value the current value of the attribute.

This property is mainly provided to support conditional validation on the client-side. If this property is not set, this validator will be always applied on the client-side.

The following example will enable the validator only when the country currently selected is USA:

function (attribute, value) {
    return $('#country').val() === 'USA';
}

See also $when.

public string $whenClient = null

Method Details