What is the limitation of using cookies to retrieve login information from a different domain in PHP?

When trying to retrieve login information from a different domain using cookies in PHP, the limitation is that cookies are domain-specific and cannot be accessed across different domains for security reasons. To solve this issue, you can use session variables instead of cookies to store and retrieve login information as they are not restricted by domain boundaries. 

// Start the session
session_start();

// Set the login information in session variables
$_SESSION['username'] = 'example_username';
$_SESSION['email'] = 'example_email@example.com';

// Retrieve the login information from session variables
$username = $_SESSION['username'];
$email = $_SESSION['email'];

// Output the login information
echo "Username: $username, Email: $email";

Keywords

cookies login information different domain limitation PHP

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