如何在PHP中获取div中的所有链接

$html = '<div id="myDiv">
              <a href="link1">Link 1</a>
              <a href="link2">Link 2</a>
              <a href="link3">Link 3</a>
         </div>';

$dom = new DOMDocument();
$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
$links = $xpath->query("//div[@id='myDiv']//a");

foreach ($links as $link) {
    $url = $link->getAttribute('href');
    echo $url . PHP_EOL;
}