我在许多项目中都做了类似的事情，下面是我是如何做到的：

<div class="user-panel">
    <ul>
        <?php
        if (is_user_logged_in() ) {
            // When the user is Logged-in
            $current_user= wp_get_current_user();
            echo \'<li>\'. __( \'Welcome, \', \'text-domain\' ) .\'<strong>\'. $current_user->user_nicename .\'</strong></li>\';
            echo \'<li><a href="\'. wp_logout_url( home_url() ) .\'" title="Log out">\'. __( \'Log out\', \'text-domain\' ) .\'</a></li>\';
        }
        else
        {
            // When user is logged-out
            echo \'<li><a href="\'. wp_registration_url() .\'" title="Register a New Account">\'. __( \'Register\', \'text-domain\' ) .\'</a></li>\';
            echo \'<li><a href="\'. wp_login_url() .\'" title="Login to the site">\'. __( \'Login\', \'text-domain\' ) .\'</a></li>\';
        } ?>
    </ul>
</div>
<!-- /.user-panel -->