How to add Width and Height attributes on Post Thumbnail Medium size?

  • Hi, I need some clue here. I hope someone can point me to the right direction.

    I am displaying featured images with medium size on feed pages. I added <?php the_post_thumbnail('medium'); ?> on the loop template file.

    And, for schema.org markup, I also added itemprop image attribute to the featured images with below code on my theme’s functions.php.

    add_filter('wp_get_attachment_image_attributes', 'ipwp_img_attr', 10, 2);
function ipwp_img_attr($attr) {
    $attr['itemprop'] = 'image';
    return $attr;
}

    The result is:
    <img src=”https://my-site.com/wp-content/uploads/YYYY/MM/my-image.png&#8221; class=”attachment-medium wp-post-image” alt=”My Image” itemprop=”image”>

    It’s missing width and height attributes. I need them to score higher on page speed tests.

    Anyone knows how to add the width and height attributes there?

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