yii\i18n\Formatter::asEmail PHP Метод

    public function asEmail($value, $options = [])
    {
        if ($value === null) {
            return $this->nullDisplay;
        }
        return Html::mailto(Html::encode($value), $value, $options);
    }

 public function testAsEmail()
 {
     $value = '*****@*****.**';
     $this->assertSame("<a href=\"mailto:{$value}\">{$value}</a>", $this->formatter->asEmail($value));
     // null display
     $this->assertSame($this->formatter->nullDisplay, $this->formatter->asEmail(null));
 }