What potential issues can arise when setting cookies in PHP, particularly with browser compatibility?

Potential issues that can arise when setting cookies in PHP include compatibility issues with certain browsers that may not support cookies or may have restrictions on cookie settings. To ensure compatibility, it's important to set the cookie parameters correctly, such as the domain, path, expiration time, and secure flag. Additionally, using the `setcookie()` function in PHP allows you to easily set cookies with the necessary parameters for better browser compatibility.

// Set a cookie with proper parameters for better browser compatibility
setcookie('cookie_name', 'cookie_value', time() + 3600, '/', 'example.com', true, true);