Question

It’s didn’t work

array('fio', 'length', 'min'=>5, 'max'=>30, 'message' => 'custom'),

but this work

array('fio, login, password', 'required', 'message' => '{attribute} custom'),

Answer 1

For CStringValidator, there is another property called is which specifies the exact length of a string, and the message property is used only when is property is not satisfied by the input.

Take a look at the source, and this will become clear:

if($this->is!==null && $length!==$this->is)
{
    $message=$this->message!==null?$this->message:Yii::t('yii','{attribute} is of the wrong length (should be {length} characters).');
    $this->addError($object,$attribute,$message,array('{length}'=>$this->is));
}