kokjan/frontend/components/MetaComponent.php

<?php

namespace frontend\components;

use yii\base\Component;
use Yii;

class MetaComponent extends Component
{

    public $keywords = 'องค์การบริหารส่วนตำบลบอน,อบต.บอน';
    public $description = 'องค์การบริหารส่วนตำบลบอน';

    public $image = 'https://kokjan.go.th/img/nopic.png';

    public function displaySeo()
    {

        Yii::$app->view->registerMetaTag([
            'name' => 'description',
            'content' => $this->description,
        ]);
        Yii::$app->view->registerMetaTag([
            'name' => 'keywords',
            'content' => $this->keywords,
        ]);
        Yii::$app->view->registerMetaTag([
            'name' => 'og:description',
            'content' => $this->description,
        ]);
        Yii::$app->view->registerMetaTag([
            'name' => 'og:type',
            'content' => 'websites',
        ]);
        Yii::$app->view->registerMetaTag([
            'name' => 'og:image',
            'content' => $this->image,
        ]);
        Yii::$app->view->registerMetaTag([
            'name' => 'twitter:description',
            'content' => $this->description,
        ]);

        Yii::$app->view->registerMetaTag([
            'name' => 'twitter:image',
            'content' => $this->image,
        ]);
    }

    public function getFirstImage($content)
    {

        $first_img = '';
        $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $content, $matches);
        $first_img = $matches[1][0];

        if (empty($first_img)) {
            $first_img = 'https://kokjan.go.th/img/nopic.png';
        }
        return $first_img;
    }
}