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<?php
$nav = array(
    'Home' => '/home',
    'Products' => '/products',
    'Company' => '/company',
    'Privacy Policy' => '/privacy-policy',
);

/**
 * Class NavBuilder
 */
class NavBuilder extends CachingIterator
{

    /**
     * Override the current() method to modify the return value
     * for the given index.
     *
     * @access  public
     * @return  string
     */
    public function current()
    {

        // get the name and url of the nav item
        $name = parent::key();
        $url = parent::current();

        // determine if we're on the last element
        // cacheIterator
        if ($this->hasNext()) {
            return '<li><a href="'.$url.'">'.$name.'</a></li>';
        } else {
            return '<li class="last"><a href="'.$url.'">'.$name.'</a></li>';
        }
    }

    /**
     * Outputs the navigation.
     */
    public function render()
    {

        $output = '<ul>';
        foreach ($this as $iterator) {
            $output .= $this->current();
        }
        $output .= '</ul>';

        return $output;
    }

}

try {
    $navBar = new NavBuilder(new ArrayIterator($nav));
    echo $navBar->render();
} catch (Exception $e) {
    var_dump($e);
}