防止DOMDocument :: loadHTML()转换实体 [英] Preventing DOMDocument::loadHTML() from converting entities

问题描述

我有一个要提取其列表项的字符串值.我想提取文本和任何子节点，但是DOMDocument会将实体转换为字符，而不是保持原始状态.

I have a string value that I'm trying to extract list items for. I'd like to extract the text and any subnodes, however, DOMDocument is converting the entities to the character, instead of leaving in the original state.

我尝试将DOMDocument :: resolveExternals和DOMDocument :: substituteEntities设置为false，但这无效.应该注意的是，我正在使用PHP 5.2.17在Win7上运行.

I've tried setting DOMDocument::resolveExternals and DOMDocument::substituteEntities for false, but this has no effect. It should be noted I'm running on Win7 with PHP 5.2.17.

示例代码为:

$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最终转换为½. (单个字符/UTF-8版本，而不是实体版本)，这不是所需的格式.

½ ends up getting converted to ½ (single character / UTF-8 version, not entity version), which is not the desired format.

推荐答案

基于

Based on the answer provided by ajreal, I've expanded the example variable to handle more cases, and changed _get_inner_html() to make recursive calls and handle the entity conversion for text nodes.

这可能不是最佳答案，因为它对元素进行了一些假设(例如没有属性).但是由于我的特殊需求并不需要携带属性(但是，我确定我的样本数据稍后会扔给我)，因此该解决方案对我有用.

It's probably not the best answer, since it makes some assumptions about the elements (such as no attributes). But since my particular needs don't require attributes to be carried across (yet.. I'm sure my sample data will throw that one at me later on), this solution works for me.

$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;
}

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