How to Add Article Schema without a Plugin

When it comes to schema markup, the most complicated one is the one that you have to add to all your posts and pages.

Adding schema markup to all posts and past is something that nobody is willing to do manually, especially when you have hundreds and hundreds of posts.

If you add this to your functions.php file, it will add the basic article schema to all your posts.

function add_article_schema_to_posts() {
  if ( is_single() && 'post' == get_post_type() ) {
    $schema = '{
      "@context": "https://schema.org",
      "@type": "Article",
      "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": "' . get_permalink() . '"
      },
      "headline": "' . get_the_title() . '",
      "image": {
        "@type": "ImageObject",
        "url": "' . get_the_post_thumbnail_url() . '"
      },
      "datePublished": "' . get_the_date( 'c' ) . '",
      "dateModified": "' . get_the_modified_date( 'c' ) . '",
      "author": {
        "@type": "Person",
        "name": "' . get_the_author() . '"
      },
      "publisher": {
        "@type": "Organization",
        "name": "' . get_bloginfo( 'name' ) . '",
        "logo": {
          "@type": "ImageObject",
          "url": "' . get_site_icon_url() . '"
        }
      },
      "description": "' . wp_strip_all_tags( get_the_excerpt() ) . '"
    }';
    echo '<script type="application/ld+json">' . $schema . '</script>';
  }
}
add_action( 'wp_head', 'add_article_schema_to_posts' );

---