What are some best practices for handling popups and advertisements on a website to ensure a positive user experience?

To ensure a positive user experience, it is important to limit the number of popups and advertisements on a website. Popups should be used sparingly and only when necessary, such as for important notifications or calls to action. Ads should be placed strategically and not disrupt the user's browsing experience.

// Example PHP code to limit the number of popups and advertisements on a website

// Check if the user has already seen a popup within a certain time frame
if(!isset($_SESSION['popup_displayed']) || (isset($_SESSION['popup_displayed']) && $_SESSION['popup_displayed'] < time() - 86400)) {
    // Display popup code here
    $_SESSION['popup_displayed'] = time();
}

// Place ads strategically throughout the website
// Ad code here