What are the best practices for managing and updating PHP code in a WordPress environment, especially for displaying content on specific monitors?

To manage and update PHP code in a WordPress environment for displaying content on specific monitors, it is recommended to create a custom function that checks the user's monitor size and conditionally displays content based on that. This can be achieved by using PHP functions like wp_is_mobile() to detect mobile devices and media queries in CSS to target specific monitor sizes.

function display_content_based_on_monitor() {
    if ( wp_is_mobile() ) {
        // Display content for mobile devices
        echo '<p>Content for mobile devices</p>';
    } else {
        // Display content for desktop devices
        echo '<p>Content for desktop devices</p>';
    }
}
add_action( 'wp_footer', 'display_content_based_on_monitor' );