What are the best practices for reading cookies in PHP to ensure their availability across different scripts?

When reading cookies in PHP to ensure their availability across different scripts, it is important to set the correct path and domain for the cookie. This ensures that the cookie can be accessed by all scripts within the specified path and domain. Additionally, using the setcookie() function with the correct parameters will help in properly reading the cookie values.

// Set the cookie with the correct path and domain
setcookie("cookie_name", "cookie_value", time() + 3600, "/", "example.com");

// Read the cookie value
$cookie_value = $_COOKIE['cookie_name'];

// Use the cookie value in your script
echo $cookie_value;