How can the structure of PHP scripts impact the efficiency and security of cookie handling?

The structure of PHP scripts can impact the efficiency and security of cookie handling by determining how cookies are set, accessed, and validated. To ensure efficiency and security, it is important to properly sanitize and validate cookie data, set secure flags like HttpOnly and Secure, and implement mechanisms to prevent common security vulnerabilities like XSS and CSRF attacks.

// Example of setting a secure cookie with HttpOnly and Secure flags
setcookie("user", "John Doe", time() + 3600, "/", "example.com", true, true);