What role does the file location and path play in the functionality of PHP cookies?

The file location and path play a crucial role in the functionality of PHP cookies as they determine where the cookie is stored and accessible. If the file location or path is incorrect, the cookie may not be set or retrieved properly. To ensure the correct functionality of PHP cookies, always specify the correct file location and path when setting or retrieving cookies.

// Set a cookie with a specific path
setcookie("user", "John Doe", time() + 3600, "/path/to/cookie");

// Retrieve a cookie with a specific path
$user = $_COOKIE['user'];