您可以使用 DOMDocument.像这样:

function changeIframe($html) {

    $dom = new DOMDocument;
    $dom->loadHTML($html);
    $iframes = $dom->getElementsByTagName('iframe');
    if (isset($iframes[0])) {
        $iframes[0]->setAttribute('height', '600');
        $iframes[0]->setAttribute('scrolling', 'no');
        return $dom->saveHTML($iframes[0]);
    } else {
        return false;
    }
}

$html = '<iframe src="someurl.com" width="540" height="450" scrolling="yes" style="border: none;"></iframe>';

echo changeIframe($html);

通过这种方法，您可以根据需要修改iframe.

With this method you can modify iframe as you want.

谢谢.