php - DOMDocument::loadHTML error

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php - DOMDocument::loadHTML error

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

php - 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;
}

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1 Reply

深蓝 · Answer 1 · 2021-10-17T00:58:30+0000

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.

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