php - 从phpquery对象获取xpath

Question

i'm using PHPquery to parse HTML file for example i have this file

<div id="header" class="clearit" role="banner">
        <div id="headerWrapper">
            <ul id="primaryNav" role="navigation">
                <li id="musicNav" class="navItem">
                    <a href="/music" class="nav-link">Music</a>
                </li>
                <li id="listenNav" class="navItem">
                    <a href="/listen" class="nav-link">Radio</a>
                </li>
                <li id="eventsNav" class="navItem">
                    <a href="/events" class="nav-link">Events</a>
                </li>
                <li id="chartsNav" class="navItem">
                    <a href="/charts" class="nav-link">Charts</a>
                </li>
                <li id="communityNav" class="navItem">
                    <a href="/community" class="nav-link">Community</a>
                </li>
                <li id="originalsNav" class="navItem">
                    <a href="http://originals.last.fm" class="nav-link">Originals</a>
                </li>
            </ul>
      </div>
</div>

the query :

$link=pq(".nav-link")->eq(0);
$xpath=$link->xpath;

now xpath is an DOMXpath object and i want to get the Xpath for this object like :

$result="//html//body//div//div//ul//li[0]//a[0]";

if this not possible in PHPquery how can i get it in PHP?