Add login logout with avatar

header.php

<?php

if (is_user_logged_in()) {
    global $current_user;
    get_currentuserinfo();
    echo '<div class="wrapper"><div class="user-info"><span class="user-details left"><div class="user-info">Hello, </span>' . '<span class="user-details">' . $current_user->display_name . '</span>';

    echo '<a class="user-logout" href="/wp-login.php?action=logout"> logout</a></div> </div>';
    echo '<div class="right-avatar" href="/wp-login.php?action=logout">' . get_avatar($current_user->user_email) . '</div></div>';

} else {
    echo '<div class="login-register"><a class="user-login" href="/login?action=login">login</a>';
    echo '<a class="user-register" href="/wp-login.php?action=register">/<span class="user-register">register</span></a></div>';
}

?>