How to write a rule to check for non-empty lines and save them?

Question

Yii

So I save the data from the tabular form to the database, I need to write a rule that would check that if the string is empty then do not save if it is filled then save

<code lang="php">
protected function populatePhoneForFioID($fioId, $typeId, $phoneNumber) {
        if(!empty ($_POST['Number']) ){
        $phone = new Phone;
        $phone->FIO_ID = $fioId;
        $phone->Type_ID = $typeId;
        $phone->Number = $phoneNumber;

            $phone->save();
        }

  }
</code>

<div class="row">
            <?php echo CHtml::form();
            $data2 = CHtml::listData(Type::model()->findAll(), 'ID', 'Type_Phone');
            foreach ($data2 as $key => $value){
                echo $form->hiddenField($phone, '['.$key.']Type_ID', array('value'=>$key));
                echo"<tb>". $value."</br>".
                    $form->textArea($phone, '['.$key.']Number', array('rows'=>1, 'cols'=>40))."</br>"."</tb>";
            } ?>
        </div>

above is the code of the form in which you need to check for empty lines or not