如何使用php DOMDocument从子节点获取文本

我一直在编写一个php代码来从一个站点获取信息，到目前为止我能够获取href属性，但是我找不到从子节点“span”获取文本的方法，有人能帮我吗

html->

<a class="js-publication" href="publication/247931167"> 
    <span class="publication-title">An approach for textual authoring</span> 
</a>

你可以用

---

    @$dom->loadHTMLFile($curPage);
    $anchors = $dom->getElementsByTagName('a'); 
    foreach ($anchors as $element) {            
        $class_ = $element->getAttribute('class');
        if (0 !== strpos($class_, 'js-publication')) {
            $href = $element->getAttribute('href');
            if(0 === stripos($href,'publication/')){
                echo $href;//link para a publicação;
                echo "\n";
            }
        }
    }

$html = <<< LOL
<a class="js-publication" href="publication/247931167"> 
    <span class="publication-title">An approach for textual authoring</span> 
</a>
LOL;

$dom = new DOMDocument();
$dom->loadHTML($html);
$xpath = new DOMXpath($dom);
foreach ($xpath->query("//a[@class='js-publication']") as $element){
    echo $element->getAttribute('href');
    echo $element->textContent;
}
//publication/247931167
//An approach for textual authoring

echo $xpath->query("//a[@class='js-publication']/span")[0]->textContent;
echo $xpath->query("//a[@class='js-publication']")[0]->getAttribute('href');