是否可以从网页中拉出所有iframe标签[重复]

Question

This question already has an answer here:

• Grabbing the href attribute of an A element 10 answers

I don't know whether it is possible or not. There is a webpage that Has so many <iframe> tags (youtube, facebook etc video embeds) like this

<iframe src="https://www.facebook.com/video/embed?video_id=483633655049394"
width="680" height="450" frameborder="0"></iframe>

<iframe width="680" height="450" src="http://www.youtube.com/embed/XpEnFZGkK8A
frameborder="0" allowfullscreen=""></iframe>

I want to do the following

I give the URL of the Webpage and It resturns me all the <iframe> ... </iframe> tags.

How Can I do that in php.

</div>

Answer 1

No xpath is required here. You can use DOMDocument::getElementsByTagName('iframe');. Check the comment of @Bamar below the question (thx). I expect using DOM without xpath being faster.

However I'll keep the original xpath answer for reference.

---

Original answer

Use the following xpath query:

//iframe

it will select all the <iframe> tags in document regardless of their position in the document tree.

Example:

$doc = new DOMDocument();
$doc->loadHTML($yourhtml);

$selector = new DOMXPath($doc);

foreach($selector->query('//iframe') as $iframe) {
    echo $iframe->getAttribute('src');
}