如何检查表tr th / td是否存在于页面php中

Question

I am trying to verify table tr th / td or dl dt / dd exist or not in the page. So I tried to do something like below.

foreach($links as $k => $val){
    $html = file_get_contents($val);
     if (strpos($val, "</table>") !== false) {
       echo "table exist";
     }
     elseif(strpos($val, "</dl>")!== false){
            echo "dl exist";
     }
}

But it's not working. Any possible way to verify html has certain elements? Or is html has certain amount elements. for example more than 5 th or more than 5 dd

Answer 1

You can use getElementsByTagName of DOM

$dom = new DOMDocument();
$dom->loadHTMLFile('filename.html');
$tableRow = $dom->getElementsByTagName('tr');
foreach ($tableRow as $tr) {
   echo $tr->nodeValue;
   echo $tableRow->length;
}