get_currentuserinfo();
$username = $current_user->user_login

这将非常方便，因为您可以根据用户名验证用户，然后根据UID在DB中分配密钥。

因为问题是如何从cookies中获取用户名，所以这里有一个解决方案：

function is_user_administrator(): string {
    if ( function_exists( \'get_site_option\' ) ) {
        $siteurl = get_site_option( \'siteurl\' );
        if ( $siteurl ) {

            $cookie_hash = \'wordpress_logged_in_\' . md5( $siteurl );
            if ( ! isset( $_COOKIE[ $cookie_hash ] ) ) {
                return \'\';
            }
            $cookie = $_COOKIE[ $cookie_hash ];

            $cookie_parts = explode( \'|\', $cookie ); // 0 => user_login, 1 => expiration, 2 => token, 3 => hmac
            // check if the cookie has the correct number of parts, if not then we can\'t be sure that $cookie_parts[0] is the user name
            if ( count( $cookie_parts ) !== 4 ) {
                return \'\';
            }
            return $cookie_parts[0];
        }
    }
}