customize userNav display

<span id="user-avatar">{$userImage}</span> <span id="user-username">{$username}</span>

[[+modx.user.id:userinfo=`fullname`]]

[[!+modx.user.id:userinfo=`fullname`]]

[[!+modx.user.id:userinfo=`fullname`]]

[[!GetFullname]]

<?php
/*GetFullname snippet */
$profile = $modx->user->getOne('Profile');
if ($profile) {
    return $profile->get('fullname');
}
/* Fall back to username if the user has no profile */
return $modx->user->get('username');

<ul id="modx-user-menu">
    {* eval is used here to support nested variables *}
    {eval var=$userNav}
</ul>

<span id="user-avatar">{$userImage}</span> <span id="user-username">{$username}</span>

/**
 * Set a bunch of placeholders to be used within Smarty templates
 *
 * @return void
 */
public function setPlaceholders()
{
    $placeholders = array(
        'username' => $this->modx->getLoginUserName(),
        'userImage' => $this->getUserImage(),
    );

    $this->controller->setPlaceholders($placeholders);
}

    /**
     * Set a bunch of placeholders to be used within Smarty templates
     *
     * @return void
     */
    public function setPlaceholders()
    {
        $profile = $this->modx->user->getOne('Profile');
        
        $placeholders = array(
            'username' => $profile->get('fullname'),
            'userImage' => $this->getUserImage(),
        );

        $this->controller->setPlaceholders($placeholders);
    }