DOMDocument::loadHTML error
I build a script that combines all css on a page together to use it in my cms. It worked fine for a long time now i i get this error:
Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Tag header invalid in Entity, line: 10 in css.php on line 26
Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Tag nav invalid in Entity, line: 10 in css.php on line 26
Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Tag section invalid in Entity, line: 22 in css.php on line 26
This is the php script
This is my code:
<?php
header('Content-type: text/css');
include ('../global.php');
if ($usetpl == '1') {
$client = New client();
$tplname = $client->template();
$location = "../templates/$tplname/header.php";
$page = file_get_contents($location);
} else {
$page = file_get_contents('../index.php');
}
class StyleSheets extends DOMDocument implements IteratorAggregate
{
public function __construct ($source)
{
parent::__construct();
$this->loadHTML($source);
}
public function getIterator ()
{
static $array;
if (NULL === $array) {
$xp = new DOMXPath($this);
$expression = '//head/link[@rel="stylesheet"]/@href';
$array = array();
foreach ($xp->query($expression) as $node)
$array[] = $node->nodeValue;
}
return new ArrayIterator($array);
}
}
foreach (new StyleSheets($page) as $index => $file) {
$css = file_get_contents($file);
echo $css;
}
Answer
Header, Nav and Section are elements from HTML5. Because HTML5 developers felt it is too difficult to remember Public and System Identifiers, the DocType declaration is just:
<!DOCTYPE html>
In other words, there is no DTD to check, which will make DOM use the HTML4 Transitional DTD and that doesnt contain those elements, hence the Warnings.
To surpress the Warnings, put
libxml_use_internal_errors(true);
before the call to loadHTML and
libxml_use_internal_errors(false);
after it.
An alternative would be to use https://github.com/html5lib/html5lib-php.