bla bla...
some test
bla bla more text
DATA;
$doc = new DOMDocument();
$doc->loadHTML($data, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($doc);
$ids = [];
foreach ($xpath->query("//li[@data-id]") as $item) {
$ids[] = $item->getAttribute('data-id');
}
print_r($ids);
?>