Categories featured images

Thank you for your answer. I asked Gemini AI and it gave me this code.I don’t know if its ok but I will try it and i will inform you

<?php
// User Submitted Posts - Core Functions

if (!defined('ABSPATH')) die();

function usp_auto_display_images($content) {

    global $usp_options;

    $enable = isset($usp_options['auto_display_images']) ? $usp_options['auto_display_images'] : 'disable';

    if (usp_is_public_submission() && ($enable === 'before' || $enable === 'after')) {

        $markup = isset($usp_options['auto_image_markup']) ? $usp_options['auto_image_markup'] : '';
        $author = get_post_meta(get_the_ID(), 'user_submit_name', true);

        $post_id = get_the_ID();
        $categories = get_the_category($post_id);

        $featured_image_set = false; // Flag to check if featured image was set

        if ($categories) {
            foreach ($categories as $category) {
                // Check if category has a default featured image
                $default_featured_image_url = get_category_meta($category->term_id, 'default_featured_image', true);

                if ($default_featured_image_url && !$featured_image_set) {
                    // Set default featured image
                    $featured_image_id = usp_get_attachment_id_from_url($default_featured_image_url);
                    if ($featured_image_id) {
                        set_post_thumbnail($post_id, $featured_image_id);
                        $featured_image_set = true;
                    }
                }
            }
        }

        $args = array(
            'post_type'     => 'attachment',
            'post_parent' => $post_id,
            'numberposts' => -1,
        );

        $args = apply_filters('usp_image_args', $args);

        $attachments = get_posts($args);

        if ($attachments) {
            // Display other images inside the article
            $images = '<p>';

            foreach ($attachments as $attachment) {
                $title  = apply_filters('usp_image_title',  $attachment->post_title);
                $thumb  = apply_filters('usp_image_thumb',  wp_get_attachment_image_src($attachment->ID, 'thumbnail', false));
                $medium = apply_filters('usp_image_medium', wp_get_attachment_image_src($attachment->ID, 'medium', false));
                $large  = apply_filters('usp_image_large',  wp_get_attachment_image_src($attachment->ID, 'large', false));
                $full   = apply_filters('usp_image_full',     wp_get_attachment_image_src($attachment->ID, 'full', false));
                $custom_size = apply_filters('usp_image_custom_size', 'custom');
                $custom = apply_filters('usp_image_custom', wp_get_attachment_image_src($attachment->ID, $custom_size, false));
                $parent_id = wp_get_post_parent_id($attachment->ID);
                $parent_title = get_the_title($parent_id);
                $url = apply_filters('usp_url_custom_field', get_post_meta(get_the_ID(), 'user_submit_url', true));

                $images .= usp_replace_image_vars($markup, $title, $thumb, $medium, $large, $full, $custom, $parent_title, $author, $url);
            }

            $images .= '</p>';

            if ($enable === 'before') $content = $images . $content;
            elseif ($enable === 'after') $content = $content . $images;
        }
    }

    return $content;
}
add_filter('the_content', 'usp_auto_display_images');

// Helper function to get attachment ID from URL
function usp_get_attachment_id_from_url($image_url) {
    global $wpdb;
    $attachment = $wpdb->get_col($wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE guid='%s';", $image_url));
    if ($attachment) {
        return $attachment[0];
    }
    return false;
}