问题
I need to load, modify and output some 3rd party iframe on my webpage. As suggested, I had created the intermediary page that simply contains <iframe> with its src attribute.
The php code that outputs the page looks like this:
$iframe->loadHTML(file_get_contents("http://example.com/iframe_page.php")); //creating DOM object, see htm content below
$xpathObj= new DOMXPath($iframe);//creating DOMXPath object
foreach ($xpathObj->query('//div[@id="specific_id"]') as $node){ //this query returns nothing
$node->parentNode->removeChild($node);//i need to remove the div with that id, but there is nothing to remove
}
echo $iframe->saveHTML($iframe->documentElement);//the iframe output works fine
And the content of my iframe looks something like this:
<html>
<head>
</head>
<body>
<div>
<div>
<div id="specific_id">
</div>
</div>
</div>
</body>
</html>
I've even tried disabling JS to see if this div is placed there by front-end code and nope with JS disabled the structure of the document looks exactly the same.
回答1:
The answer is rather simple. You CAN'T manipulate iframe element crossdomain using PHP DOMDocument.
来源：https://stackoverflow.com/questions/43718492/domxpath-query-returns-nothing