php DOMDocument 递归 格式化缩进HTML文档

时间：2023-12-21 11:46:50
function format(\DOMNode $node, $treeIndex = 0)

{

    //不格式化的标签

    if (in_array($node->nodeName, ['title', 'p', 'span', 'li']))

        return;

    if ($node->hasChildNodes()) {

        $treeIndex++;

        $tabStart = "\r\n" . str_repeat("\t", $treeIndex);

        $tabEnd = "\r\n" . str_repeat("\t", $treeIndex - 1);

        $i = 0;

        while ($childNode = $node->childNodes->item($i++)) {

            if ($childNode->nodeType == XML_TEXT_NODE) {

                if (ctype_space(str_replace("\xc2\xa0", '', $childNode->nodeValue))) {

                    $node->removeChild($childNode);

                    $i--;

                    continue;

                }

                $childNode->nodeValue = trim($childNode->nodeValue);

            }

            $node->insertBefore($node->ownerDocument->createTextNode($tabStart), $childNode);

            $i++;

            $this->format($childNode, $treeIndex);

        };

        $node->appendChild($node->ownerDocument->createTextNode($tabEnd));

    }

}

$html = '<!DOCTYPE html><html><head><meta charset="utf-8"><title></title></head><body></body></html>';

$doc = new \DOMDocument();

//$doc->formatOutput = true; //不知道是不是我的理解问题，这个选项格式化出来的并不完美

$doc->loadHTML($html);

format($doc->documentElement);

echo $doc->saveHTML();

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