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The following example shows how the validation rules for the Most validators have default error messages that will be added to the model being validated when its attributes fail the validation.For example, the required validator will add a message "Username cannot be blank." to a model when the Some validators may support additional error messages to more precisely describe different causes of validation failures.function validates the above GUID although it isn’t valid.Now, let’s try the second function that uses the validation script and parse method: No error, all GUIDs are valid.You may create inline validators or standalone validators.An inline validator is one defined in terms of a model method or an anonymous function.If you want to make sure a rule is always applied, you may configure the skip On Empty and/or skip On Error properties to be A standalone validator is a class extending yii\validators\Validator or its child class.You may implement its validation logic by overriding the yii\validators\Validator::validate Attribute() method.

Instead, they will process the values and save them back to the attributes being validated.

validating email addresses), you may call the validate() method of the desired validator, like the following: .

Besides using the core validators included in the Yii releases, you may also create your own validators.

The signature of the method/function is: If an attribute fails the validation, the method/function should call yii\base\Model::add Error() to save the error message in the model so that it can be retrieved back later to present to end users.

Below are some examples: Note: By default, inline validators will not be applied if their associated attributes receive empty inputs or if they have already failed some validation rules.

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