/**
* get image object info for SEO
* @return array
*/
public function getImageObject()
{
$key = 'cache_blog_image_object_' . $this->id;
$img = Yii::$app->cache->get($key);
if ($img === false) {
$flag = false;
$doc = new DOMDocument();
$doc->loadHTML($this->content);
$tags = $doc->getElementsByTagName('img');
$img = ['url' => '', 'width' => '', 'height' => ''];
foreach ($tags as $i => $tag) {
$img['url'] = $tag->getAttribute('src');
$img['width'] = $tag->getAttribute('width');
$img['height'] = $tag->getAttribute('height');
$flag = true;
break;
}
if ($flag) {
/* cache */
$sql = (new Query())->select('updated_at')->from(Blog::tableName())->where(['id' => $this->id])->createCommand()->rawSql;
$dependency = new DbDependency();
$dependency->sql = $sql;
Yii::$app->cache->set($key, $img, 0, $dependency);
} else {
Yii::$app->session->setFlash('warning', Yii::t('app', 'Missing image in blog post.'));
}
}
return $img;
}
