wcfm product categories of store - shortcode

add_shortcode('wcfm_store_categories', function($attr) {
    global $wpdb, $post;

    $store_id = '';
    if ( isset( $attr['id'] ) && !empty( $attr['id'] ) ) { $store_id = absint($attr['id']); }

    if ( !$store_id && wcfm_is_store_page() ) {
        $wcfm_store_url = wcfm_get_option( 'wcfm_store_url', 'store' );
        $store_name = apply_filters( 'wcfmmp_store_query_var', get_query_var( $wcfm_store_url ) );
        $store_id  = 0;
        if ( !empty( $store_name ) ) {
            $store_user = get_user_by( 'slug', $store_name );
        }
        $store_id           = $store_user->ID;
    }

    if( !$store_id && is_product() ) {
        $store_id = $post->post_author;
    }

    if( !$store_id && is_single() && $post && is_object( $post ) && wcfm_is_vendor( $post->post_author ) ) {
        $store_id = $post->post_author;
    }

    if( !$store_id ) return;

    $sql = $wpdb->prepare("SELECT `name` FROM {$wpdb->prefix}wcfm_store_categories AS cat
        INNER JOIN {$wpdb->prefix}wcfm_store_categories_mapping AS map ON cat.ID = map.store_category_id
        WHERE `is_active` = %d and `vendor_id` = %d", 1, $store_id);

    $store_categories = $wpdb->get_col($sql);
    if( !empty( $store_categories ) ) {
        return '<p class="store-phone"><i class="wcfmfa fa-layer-group" aria-hidden="true"></i> ' . implode(', ', $store_categories) . '</p>';
    } else {
        return '<p>No categories found for this store.</p>';
    }
});