如何使用PHP Dom提取innerHTML

Question

我目前使用nodeValue来输出HTML，但它会去掉HTML代码并只给我纯文本。有谁知道我如何修改代码以通过ID获取元素的内部HTML？

function getContent($url, $id){

// This first section gets the HTML stuff using a URL
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
$html = curl_exec($ch);
curl_close($ch);

// This second section analyses the HTML and outputs it
$newDom = new domDocument;
$newDom->loadHTML($html);
$newDom->preserveWhiteSpace = false;
$newDom->validateOnParse = true;

$sections = $newDom->getElementById($id)->nodeValue;
echo $sections;


}

- user1259294

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现在这段代码是做什么的？（$sections 里面有什么内容？） - enygma

你尝试过使用 $sections = $newDom->getElementById($id)->saveHTML(); 吗？ - Martin

$newDom->saveHTML($newDom->getElementById($id)); http://ru2.php.net/manual/zh/domdocument.savehtml.php - kirilloid

Answer 1

这对我有效：

注：该句为英文原文，无需翻译。

$sections = $newDom->saveXML($newDom->getElementById($id));

http://www.php.net/manual/zh/domdocument.savexml.php

如果您使用的是 PHP 5.3.6，这也是一种选择：

$sections = $newDom->saveHTML($newDom->getElementById($id));

http://www.php.net/manual/en/domdocument.savehtml.php

- Martin

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嘿，马丁，太棒了。运行正常。 - user1259294

Answer 2

我已经修改了代码，现在它对我来说运行良好。请查看下面的代码：

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
    $html = curl_exec($ch);
    curl_close($ch);
    $newDom = new domDocument;
    libxml_use_internal_errors(true);
    $newDom->loadHTML($html);
    libxml_use_internal_errors(false);
    $newDom->preserveWhiteSpace = false;
    $newDom->validateOnParse = true;

    $sections = $newDom->saveHTML($newDom->getElementById('colophon'));   
    echo $sections;

- Sapnandu