Twitter Schema Plugin

twitter_schema.php

<?php

    /*
    Plugin Name: Twitter Schema
    Plugin URI: https://digitalblender.co
    Description: Twitter Schema
    Author:  Prahlad Yeri
    Version: .1
    Author URI: https://prahladyeri.com/blog
    */

function add_twitter_card_header()
{
    #twitter cards hack
    global $post;
    if (is_single() || is_page()) {
        $twitter_url = get_permalink();
        $twitter_title = get_the_title();
        $content = get_extended($post->post_content);
        $attch_id = get_post_thumbnail_id($post->ID);
        $twitter_thumbs = wp_get_attachment_image_src($attch_id, 'full');
        $twitter_thumb = $twitter_thumbs[ 0 ];
        if (!$twitter_thumb) {
            $twitter_thumb = 'https://secure.gravatar.com/avatar/3f253507b82dd33f352c08f649caaa54?rating=PG&size=75';
        }
        ?>
            <meta name="twitter:card" content="summary"/>
            <meta name="twitter:site" content="@twitterhandle"/>
            <meta name="twitter:creator" value="@twitterhandle"/>
            <meta name="twitter:url" content="<?php echo $twitter_url; ?>"/>
            <meta name="twitter:title" content="<?php echo $twitter_title; ?>"/>
            <meta name="twitter:description" content="<?php echo esc_html($content[ 'main' ]); ?>"/>
            <meta name="twitter:image" content="<?php echo $twitter_thumb; ?>"/>
            <?php
    }
}

add_action('wp_head', 'add_twitter_card_header');