Are there any best practices or specific PHP functions that can help in displaying content from deactivated categories in an online shop?

When displaying content from deactivated categories in an online shop, a best practice is to check if the category is active before retrieving and displaying its content. This can be done using PHP functions like `get_terms()` to retrieve category information and `is_category()` to check if a category is active. By implementing this check in your code, you can prevent displaying content from deactivated categories on your online shop.

$categories = get_terms( 'category' );

foreach ( $categories as $category ) {
    if ( is_category( $category->term_id ) ) {
        // Display content from active category
        echo '<h2>' . $category->name . '</h2>';
        // Add your code to display category content here
    }
}