Adding style tags to head with PHP DOMDocument

Question

I want to create and add a set of <style> tags to the head tags of an HTML document.

I know I can start out like this:

$url_contents = file_get_contents('http://example.com');
$dom = new DOMDocument;
$dom->loadHTML($url_contents);

$new_elm = $dom->createElement('style', 'css goes here');
$elm_type_attr = $dom->createAttribute('type');
$elm_type_attr->value = 'text/css';
$new_elm->appendChild($elm_type_attr);

Now, I also know that I can add the new style tags to the HTML like this:

$dom->appendChild($ss_elm);
$dom->saveHTML();

However, this would create the following scenario:

<html>
<!--Lots of HTML here-->
</html><style type="text/css">css goes here</style>

The above is essentially pointless; the CSS is not parsed and just sits there.

I found this solution online (obviously didn't work):

$head = $dom->getElementsByTagName('head');
$head->appendChild($new_elm);
$dom->saveHTML();

Thanks for the help!!

EDIT:

Is it possible?

Answer 1

$head = $dom->getElementsByTagName('head');

Return a DOMNodeList. I think it will be better to get the first element like this

 $head = $dom->getElementsByTagName('head')->item(0);

So $head will be a DOMNode object. So you can use the appendChild method.

Answer 2

getElementsByTagName返回一个节点数组，所以可能尝试

 $head->[0]->appendChild($new_elm);

Answer 3

This is the solution that worked for me

// Create new <style> tag containing given CSS
$new_elm = $dom->createElement('style', 'css goes here');
$new_elm->setAttribute('type', 'text/css');

// Inject the new <style> Tag in the document head
$head = $dom->getElementsByTagName('head')->item(0);
$head->appendChild($new_elm);

You can also add this line at the end to have a clean indentation

// Add a line break between </style> and </head> (optional)
$head->insertBefore($dom->createTextNode("\n"));

Adding style tags to head with PHP DOMDocument

Question

EDIT:

3 answers

solution1
5 2012-09-11 22:24:25

solution2
5 ACCPTED 2012-09-11 22:24:25

solution3
2 2020-10-20 15:07:15

Adding style tags to head with PHP DOMDocument

Question

EDIT:

3 answers

solution1 5 2012-09-11 22:24:25

solution2 5 ACCPTED 2012-09-11 22:24:25

solution3 2 2020-10-20 15:07:15

solution1
5 2012-09-11 22:24:25

solution2
5 ACCPTED 2012-09-11 22:24:25

solution3
2 2020-10-20 15:07:15