CompareValidator

API reference › yii › validators › CompareValidator

class	`yii\validators\CompareValidator`
Extends	`Validator` » `yii\base\Component` » `yii\base\BaseObject`
Implements	`yii\base\Configurable`
Since	2.0
Source	`framework/validators/CompareValidator.php`

CompareValidator compares the specified attribute value with another value.

The value being compared with can be another attribute value (specified via $compareAttribute) or a constant (specified via $compareValue). When both are specified, the latter takes precedence. If neither is specified, the attribute will be compared with another attribute whose name is by appending “_repeat” to the source attribute name.

CompareValidator supports different comparison operators, specified via the $operator property.

The default comparison function is based on string values, which means the values are compared byte by byte. When comparing numbers, make sure to set the $type to TYPE_NUMBER to enable numeric comparison.

Properties

Property	Type	Description	Defined by
`$attributeNames` read-only	`array`	Attribute names.	`Validator`
`$attributes`	`array\|string`	Attributes to be validated by this validator. Default: `[]`.	`Validator`
`$behaviors` read-only	`array<yii\base\Behavior<static>>`	List of behaviors attached to this component.	`yii\base\Component`
`$builtInValidators` static	`array`	List of built-in validators (name => class or configuration) Default: ['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\TrimValidator', 'skipOnArray' => true], 'unique' => 'yii\validators\UniqueValidator', 'url' => 'yii\validators\UrlValidator', 'ip' => 'yii\validators\IpValidator'].	`Validator`
`$clientScript`	`array\|yii\validators\client\ClientValidatorScriptInterface\|null`	Client script class to use for client-side validation. Default: `null`.	`CompareValidator`
`$compareAttribute`	`string`	The name of the attribute to be compared with. Default: `null`.	`CompareValidator`
`$compareValue`	`mixed`	The constant value to be compared with or an anonymous function that returns the constant value. Default: `null`.	`CompareValidator`
`$enableClientValidation`	`bool`	Whether to enable client-side validation for this validator. Default: `true`.	`Validator`
`$except`	`array\|string`	Scenarios that the validator should not be applied to. Default: `[]`.	`Validator`
`$isEmpty`	`callable\|null`	A PHP callable that replaces the default implementation of `isEmpty()`. Default: `null`.	`Validator`
`$message`	`string\|null`	The user-defined error message. Default: `null`.	`CompareValidator`
`$on`	`array\|string`	Scenarios that the validator can be applied to. Default: `[]`.	`Validator`
`$operator`	`string`	The operator for comparison. Default: `'=='`.	`CompareValidator`
`$skipOnEmpty`	`bool`	Whether this validation rule should be skipped if the attribute value is null or an empty string. Default: `true`.	`Validator`
`$skipOnError`	`bool`	Whether this validation rule should be skipped if the attribute being validated already has some validation error according to some previous rules. Default: `true`.	`Validator`
`$type`	`string`	The type of the values being compared. Default: `self::TYPE_STRING`.	`CompareValidator`
`$validationAttributes` read-only	`array\|null`	List of attribute names.	`Validator`
`$when`	`callable\|null`	A PHP callable whose return value determines whether this validator should be applied. Default: `null`.	`Validator`
`$whenClient`	`string\|null`	A JavaScript function name whose return value determines whether this validator should be applied on the client-side. Default: `null`.	`Validator`

Methods

Method	Description	Defined by
`__construct()`	Constructor.	`yii\base\BaseObject`
`__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`
`__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.	`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()` static	Returns the fully qualified name of this class.	`yii\base\BaseObject`
`clientValidateAttribute()`	Returns the JavaScript needed for performing client-side validation.	`CompareValidator`
`createValidator()` static	Creates a validator object.	`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.	`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.	`CompareValidator`
`getFormattedClientMessage()`	Returns the formatted validation message for client-side validation.	`Validator`
`getValidationAttributes()`	Returns a list of attributes this validator applies to.	`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.	`CompareValidator`
`isActive()`	Returns a value indicating whether the validator is active for the given scenario and attribute.	`Validator`
`isEmpty()`	Checks if the given value is empty.	`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.	`Validator`
`validateAttribute()`	Validates a single attribute.	`CompareValidator`
`validateAttributes()`	Validates the specified object.	`Validator`
`compareValues()` protected	Compares two values with the specified operator.	`CompareValidator`
`formatMessage()` protected	Formats a mesage using the I18N, or simple strtr if `\Yii::$app` is not available.	`Validator`
`validateValue()` protected	Validates a value.	`CompareValidator`

Constants

Constant	Value	Description	Defined by
`TYPE_STRING`	`'string'`	Constant for specifying the comparison `$type` by numeric values. Available since 2.0.11.	`CompareValidator`
`TYPE_NUMBER`	`'number'`	Constant for specifying the comparison `$type` by numeric values. Available since 2.0.11.	`CompareValidator`

Property details

$compareAttribute

public string $compareAttribute = null

The name of the attribute to be compared with.

When both this property and $compareValue are set, the latter takes precedence. If neither is set, it assumes the comparison is against another attribute whose name is formed by appending ‘_repeat’ to the attribute being validated. For example, if ‘password’ is being validated, then the attribute to be compared would be ‘password_repeat’.

$compareValue

public mixed $compareValue = null

The constant value to be compared with or an anonymous function that returns the constant value.

When both this property and $compareAttribute are set, this property takes precedence. The signature of the anonymous function should be as follows,

function($model, $attribute) {
    // compute value to compare with
    return $value;
}

$message

public string|null $message = null

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
{compareValue}: the value or the attribute label to be compared with
{compareAttribute}: the label of the attribute to be compared with
{compareValueOrAttribute}: the value or the attribute label to be compared with

$operator

public string $operator = '=='

The operator for comparison.

The following operators are supported:

==: check if two values are equal. The comparison is done is non-strict mode.
===: check if two values are equal. The comparison is done is strict mode.
!=: check if two values are NOT equal. The comparison is done is non-strict mode.
!==: check if two values are NOT equal. The comparison is done is strict mode.
>: check if value being validated is greater than the value being compared with.
>=: check if value being validated is greater than or equal to the value being compared with.
<: check if value being validated is less than the value being compared with.
<=: check if value being validated is less than or equal to the value being compared with.

When you want to compare numbers, make sure to also set $type to number.

$type

public string $type = self::TYPE_STRING

The type of the values being compared.

The follow types are supported:

string: the values are being compared as strings. No conversion will be done before comparison.
number: the values are being compared as numbers. String values will be converted into numbers before comparison.

Method details

clientValidateAttribute()

public function clientValidateAttribute(mixed $model, mixed $attribute, mixed $view): string|null

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

Parameters

Parameter	Type	Description
`$model`	`mixed`	The data model being validated
`$attribute`	`mixed`	The name of the attribute to be validated.
`$view`	`mixed`	The view object that is going to be used to render views or view files containing a model form with this validator applied.

Returns

string|null: The client-side validation script. Null if the validator does not support client-side validation.

getClientOptions()

public function getClientOptions(mixed $model, mixed $attribute): array

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.

Parameters

Parameter	Type	Description
`$model`	`mixed`	The model being validated
`$attribute`	`mixed`	The attribute name being validated

Returns

array: The client-side validation options

Since

2.0.11

init()

public function init(): mixed

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

Returns

mixed

validateAttribute()

public function validateAttribute(mixed $model, mixed $attribute): mixed

Validates a single attribute.

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

Parameters

Parameter	Type	Description
`$model`	`mixed`	The data model to be validated
`$attribute`	`mixed`	The name of the attribute to be validated.

Returns

mixed

compareValues()

protected function compareValues(string $operator, string $type, mixed $value, mixed $compareValue): bool

Compares two values with the specified operator.

Parameters

Parameter	Type	Description
`$operator`	`string`	The comparison operator
`$type`	`string`	The type of the values being compared
`$value`	`mixed`	The value being compared
`$compareValue`	`mixed`	Another value being compared

Returns

bool: Whether the comparison using the specified operator is true.

validateValue()

protected function validateValue(mixed $value): array|null

Validates a value.

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

Parameters

Parameter	Type	Description
`$value`	`mixed`	The data value to be validated.

Returns

array|null: The error message and the array of parameters to be inserted into the error message. 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