Question

我有一个字符串值，我正在尝试提取列表项。我想提取文本和任何子节点，但DOMDocument正在将实体转换为角色，而不是保留原始状态。

我尝试将DOMDocument :: resolveExternals和DOMDocument :: substituteEntities设置为false，但这没有效果。应该注意我使用PHP 5.2.17在Win7上运行。

示例代码是：

$example = '<ul><li>text</li>'.
    '<li>&frac12; of this is <strong>strong</strong></li></ul>';

echo 'To be converted:'.PHP_EOL.$example.PHP_EOL;

$doc = new DOMDocument();
$doc->resolveExternals = false;
$doc->substituteEntities = false;

$doc->loadHTML($example);

$domNodeList = $doc->getElementsByTagName('li');
$count = $domNodeList->length;

for ($idx = 0; $idx < $count; $idx++) {
    $value = trim(_get_inner_html($domNodeList->item($idx)));
    /* remainder of processing and storing in database */
    echo 'Saved '.$value.PHP_EOL;
}

function _get_inner_html( $node ) {
    $innerHTML= '';
    $children = $node->childNodes;
    foreach ($children as $child) {
        $innerHTML .= $child->ownerDocument->saveXML( $child );
    }

    return $innerHTML;
}

½最终会转换为½（单字符/ UTF-8版本，而不是实体版本），这不是所需的格式。

Answer 1

不是PHP 5.3.6 ++的解决方案

$html =<<<HTML
<ul><li>text</li>
<li>&frac12; of this is <strong>strong</strong></li></ul>
HTML;

$doc = new DOMDocument();
$doc->resolveExternals = false;
$doc->substituteEntities = false;
$doc->loadHTML($html);
foreach ($doc->getElementsByTagName('li') as $node)
{
  echo htmlentities(iconv('UTF-8', 'ISO-8859-1', $node->nodeValue)), "\n";
}

Answer 2

基于answer provided by ajreal，我扩展了示例变量以处理更多情况，并更改了_get_inner_html（）以进行递归调用并处理文本节点的实体转换。

这可能不是最佳答案，因为它对元素做出了一些假设（例如没有属性）。但是因为我的特殊需求不需要传递属性（但是......我确定我的样本数据会在以后抛出那个），这个解决方案对我有用。

$example = '<ul><li>text</li>'.
'<li>&frac12; of this is <strong>strong</strong></li>'.
'<li>Entity <strong attr="3">in &frac12; tag</strong></li>'.
'<li>Nested nodes <strong attr="3">in &frac12; <em>tag &frac12;</em></strong></li>'.
'</ul>';

echo 'To be converted:'.PHP_EOL.$example.PHP_EOL;

$doc = new DOMDocument();
$doc->resolveExternals = true;
$doc->substituteEntities = false;

$doc->loadHTML($example);

$domNodeList = $doc->getElementsByTagName('li');
$count = $domNodeList->length;

for ($idx = 0; $idx < $count; $idx++) {
    $value = trim(_get_inner_html($domNodeList->item($idx)));

    /* remainder of processing and storing in database */
    echo 'Saved '.$value.PHP_EOL;

}

function _get_inner_html( $node ) {
    $innerHTML= '';
    $children = $node->childNodes;
    foreach ($children as $child) {
        echo 'Node type is '.$child->nodeType.PHP_EOL;
        switch ($child->nodeType) {
        case 3:
            $innerHTML .= htmlentities(iconv('UTF-8', 'ISO-8859-1', $child->nodeValue));
            break;
        default:
            echo 'Non text node has '.$child->childNodes->length.' children'.PHP_EOL;
            echo 'Node name '.$child->nodeName.PHP_EOL;
            $innerHTML .= '<'.$child->nodeName.'>';
            $innerHTML .= _get_inner_html( $child );
            $innerHTML .= '</'.$child->nodeName.'>';
            break;
        }
    }

    return $innerHTML;
}

Answer 3

不需要迭代子节点：

function innerHTML($node)
         {$html=$node->ownerDocument->saveXML($node);
          return preg_replace("%^<{$node->nodeName}[^>]*>|</{$node->nodeName}>$%", '', $html);
         }

阻止DOMDocument :: loadHTML（）转换实体

3 个答案: