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For example, the number validator supports too Big and too Small to describe the validation failure when the value being validated is too big and too small, respectively.

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For example, really work, you should declare validation rules for the attributes you plan to validate.

This should be done by overriding the yii\base\Model::rules() method.

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.

As a rule of thumb, you should never trust the data received from end users and should always validate it before putting it to good use.

Given a model populated with user inputs, you can validate the inputs by calling the yii\base\Model::validate() method.The method will return a boolean value indicating whether the validation succeeded or not.If not, you may get the error messages from the yii\base\Model::$errors property.For example, If you also need to support client-side conditional validation, you should configure the when Client property which takes a string representing a Java Script function whose return value determines whether to apply the rule or not. As you can see, these validation rules do not really validate the inputs.Instead, they will process the values and save them back to the attributes being validated.When input data are submitted from HTML forms, you often need to assign some default values to the inputs if they are empty. For example, By default, an input is considered empty if its value is an empty string, an empty array or a null.

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