Cách đăng nhập bằng email cho tài khoản wordpress

// remove the default filter
remove_filter('authenticate', 'wp_authenticate_username_password', 20, 3);
//custom authenticate, vd: đăng nhập user bởi email
add_filter('authenticate', 'fb_authenticate_username_password', 20, 3);
function fb_authenticate_username_password($user, $username, $password)
{
	// If an email address is entered in the username box, 
	// then look up the matching username and authenticate as per normal, using that.
	if (!empty($username))
		$user=get_user_by('email', $username);	//lấy user
 
	if (isset($user->user_login, $user))
		$username=$user->user_login;
 
	//print_r($user);
	// using the username found when looking up via email
	return wp_authenticate_username_password(NULL, $username, $password);
}