yii\i18n\Formatter::asImage PHP 메소드

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

 public function testAsImage()
 {
     $value = 'http://sample.com/img.jpg';
     $this->assertSame("<img src=\"{$value}\" alt=\"\">", $this->formatter->asImage($value));
     // null display
     $this->assertSame($this->formatter->nullDisplay, $this->formatter->asImage(null));
 }