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Dynamically set front page featured image from first image in latest post's ACF

  • My front page template is set to display the full content of the latest post using WP_Query and a custom page template. Now I want the home page featured image to dynamically change every time a new post is published. The goal is to show the first image from the latest post’s ACF gallery when sharing the home page on social media.

    I am not great with PHP so Im not sure if I am even approaching this the right way. So far this code does nothing. Do I need to hook my function to something else? Where am I going wrong?

    // Set front page featured image to first image in surf report cpt ACF gallery
    
    function set_home_featured_image_from_ACF_gallery () {
    
        global $post;
    
        // Get front page id
        $frontpage_id = get_option( 'page_on_front' );
    
        // Get id of latest post
        $recent_posts = wp_get_recent_posts( array( 'numberposts' => '1' ) );
    
        // Set $post_id variable to latest post id
        $post_id = $recent_posts[0]['ID']; 
    
        if ( is_front_page() ) {
    
            /* Get the home page thumbnail (should i be getting the home page thumbnail here or the post thumbnail of the latest post?) */
    
            $has_thumbnail = get_the_post_thumbnail($frontpage_id);
    
                // Get the first image from the ACF gallery in the latest post
                $images = get_field('surf_report_gallery', $post_id, false);
                $image_id = $images[0];
    
                if ( $image_id ) {
              // Set home page featured image to first ACF image 
              set_post_thumbnail( $frontpage_id, $image_id );
            }       
        }   
    }
    add_action( 'save_post', 'set_home_featured_image_from_ACF_gallery' );

    Also, every time I share the home page it wants to display an image that I have removed from the site completely. Even when I manually add a featured image in the page editor. Weird…

  • When working with ACF it is almost always best to use use acf/save_post https://www.advancedcustomfields.com/resources/acf-save_post/. There is no guarantee that ACF will have saved values using WP save_post hook.

    
    add_action('acf/save_post', 'set_home_featured_image_from_ACF_gallery');
    function set_home_featured_image_from_ACF_gallery($post_id) {
      // still need to do this
      $recent_posts = wp_get_recent_posts(array( 'numberposts' => '1'));
      if ($post_id != $recent_posts[0]->ID) {
        // this post is not the most recent post
        return;
      }
      $frontpage_id = get_option('page_on_front');
      $images = get_field('surf_report_gallery', $post_id, false);
      $image_id = 0;
      if (!empty($images)) {
        $image_id = $images[0];
      } else {
        // backup, use the post featured image?
        $image_id = get_post_thumbnail_id($post_id);
      }
      if ($image_id) {
        // remove the if statement if you want to remove the feature image
        // if a new image is not found
        set_post_thumbnail($frontpage_id, $image_id);
      }
    }
    
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