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 parameters to be inserted into the error message. Null should be returned if the data is valid.  |  
| throws | yii\base\NotSupportedException | 
 if the validator does not supporting data validation without a model  |  
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