What I want is to drop XML declaration and add <!DOCTYPE html>. Here is a code example:
$html = new DOMDocument();
$html->formatOutput = true;
$htmlNode = $html->createElement("html");
$html->appendChild($htmlNode);
$htmlNode->appendChild($html->createElement("head"));
$bodyNode = $html->createElement("body");
$bodyNode->setAttribute("data-spy", "scroll");
$bodyNode->setAttribute("data-target", "#myAffix");
$htmlNode->appendChild($bodyNode);
$mainNode = $html->createElement("main");
$bodyNode->appendChild($mainNode);
$gridcellNode = $html->createElement("div");
$gridcellNode->setAttribute("class", "grid-cell");
$mainNode->appendChild($gridcellNode);
$containerFluid = $html->createElement("div");
$containerFluid->setAttribute("class","container-fluid");
$gridcellNode->appendChild($containerFluid);
$html->saveHTMLFile("../article.html");
$html->saveHTML();
$html->save("../article2.html");
The first article.html does not contain XML declaration, but is poor formatted (without indent). The second produced article2.html has indent, but also has <?xml version="1.0"?>.
Output in article.html:
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head>
<body data-spy="scroll" data-target="#myAffix"><main><div class="grid-cell"><div class="container-fluid"></div></div></main></body>
</html>
output in article2.html:
<?xml version="1.0"?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body data-spy="scroll" data-target="#myAffix">
<main>
<div class="grid-cell">
<div class="container-fluid"/>
</div>
</main>
</body>
</html>
You can use LIBXML_NOXMLDECL option to drop the XML declaration but this is only available in Libxml >= 2.6.21, i.e.:
$html->save("../article2.html", LIBXML_NOXMLDECL);
If you don't have Libxml >= 2.6.21, your only option (afaik), is:
$output = $html->saveHTML();
$the_file = "../article2.html";
$html->save($the_file);
file_put_contents($the_file, preg_replace('/<\?xml[^>]+>\s+/', '', file_get_contents($the_file)));