How can developers ensure seamless integration between PHP code and a CMS?

To ensure seamless integration between PHP code and a CMS, developers should follow the best practices of the CMS platform they are working with. This includes using the provided APIs and hooks for extending functionality, maintaining clean and modular code structure, and properly handling data validation and sanitization.

// Example of integrating PHP code with WordPress CMS
// Register a custom post type
function custom_post_type() {
    register_post_type('custom_post', array(
        'labels' => array(
            'name' => 'Custom Posts',
            'singular_name' => 'Custom Post'
        ),
        'public' => true,
        'has_archive' => true,
    ));
}
add_action('init', 'custom_post_type');