php采集多個tr中的內容如何做

$dom = new DOMDocument();

$dom->loadHTML($html);

$props = array();

$xpath = new DOMXPath($dom);

$trNodes = $xpath->query("//tr");

foreach($trNodes as $trNode) {

$thNodes = $xpath->query("./th");

$tdNodes = $xpath->query("./td");

if($thNodes->length == 0 || $tdNodes->length == 0) continue;

props[$thNodes->item(0)->nodeValue] = $tdNodes->item(0)->nodeValue;

}

var_dump($props);