php 如何使用dom php解析器
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how to use dom php parser
提问by chris
I'm new to DOM parsing in PHP:
I have a HTML file that I'm trying to parse. It has a bunch of DIVs like this:
我是 PHP 中 DOM 解析的新手：
我有一个要解析的 HTML 文件。它有一堆像这样的 DIV：
<div id="interestingbox">
<div id="interestingdetails" class="txtnormal">
<div>Content1</div>
<div>Content2</div>
</div>
</div>
<div id="interestingbox">
......
I'm trying to get the contents of the many div boxes using php. How can I use the DOM parser to do this?
我正在尝试使用 php 获取许多 div 框的内容。我怎样才能使用 DOM 解析器来做到这一点？
Thanks!
谢谢！
回答by apelliciari
First i have to tell you that you can't use the same id on two different divs; there are classes for that point. Every element should have an unique id.
首先我必须告诉你，你不能在两个不同的 div 上使用相同的 id；有针对这一点的课程。每个元素都应该有一个唯一的 id。
Code to get the contents of the div with id="interestingbox"
获取 id="interestingbox" div 内容的代码
$html = '
<html>
<head></head>
<body>
<div id="interestingbox">
<div id="interestingdetails" class="txtnormal">
<div>Content1</div>
<div>Content2</div>
</div>
</div>
<div id="interestingbox2"><a href="#">a link</a></div>
</body>
</html>';
$dom_document = new DOMDocument();
$dom_document->loadHTML($html);
//use DOMXpath to navigate the html with the DOM
$dom_xpath = new DOMXpath($dom_document);
// if you want to get the div with id=interestingbox
$elements = $dom_xpath->query("*/div[@id='interestingbox']");
if (!is_null($elements)) {
foreach ($elements as $element) {
echo "\n[". $element->nodeName. "]";
$nodes = $element->childNodes;
foreach ($nodes as $node) {
echo $node->nodeValue. "\n";
}
}
}
//OUTPUT
[div] {
Content1
Content2
}
Example with classes:
类示例：
$html = '
<html>
<head></head>
<body>
<div class="interestingbox">
<div id="interestingdetails" class="txtnormal">
<div>Content1</div>
<div>Content2</div>
</div>
</div>
<div class="interestingbox"><a href="#">a link</a></div>
</body>
</html>';
//the same as before.. just change the xpath
[...]
$elements = $dom_xpath->query("*/div[@class='interestingbox']");
[...]
//OUTPUT
[div] {
Content1
Content2
}
[div] {
a link
}
Refer to the DOMXPathpage for more details.
有关更多详细信息，请参阅DOMXPath页面。
回答by chris
I got this to work using simplehtmldomas a start:
我使用simplehtmldom作为开始让它工作：
$html = file_get_html('example.com');
foreach ($html->find('div[id=interestingbox]') as $result)
{
echo $result->innertext;
}
回答by giorgio79
Very nice function from http://www.sitepoint.com/forums/showthread.php?611393-php5-need-something-like-innerHTML-instead-of-nodeValue
来自http://www.sitepoint.com/forums/showthread.php?611393-php5-need-something-like-innerHTML-instead-of-nodeValue 的非常好的功能
function innerXML($node)
{
$doc = $node->ownerDocument;
$frag = $doc->createDocumentFragment();
foreach ($node->childNodes as $child)
{
$frag->appendChild($child->cloneNode(TRUE));
}
return $doc->saveXML($frag);
}
$dom = new DOMDocument();
$dom->loadXML('
<html>
<body>
<table>
<tr>
<td id="foo">
The first bit of Data I want
<br />The second bit of Data I want
<br />The third bit of Data I want
</td>
</tr>
</table>
<body>
<html>
');
$xpath = new DOMXPath($dom);
$node = $xpath->evaluate("/html/body//td[@id='foo' ]");
$dataString = innerXML($node->item(0));
$dataArr = explode("<br />", $dataString);
$dataUno = $dataArr[0];
$dataDos = $dataArr[1];
$dataTres = $dataArr[2];
echo "firstdata = $nameUno<br />seconddata = $nameDos<br />thirddata = $nameTres<br />"
回答by Oleksandr Knyga
WebExtractor: https://github.com/knyga/webextractorIt can parse page with css, regex, xpath selectors.
WebExtractor：https: //github.com/knyga/webextractor它可以使用 css、regex、xpath 选择器解析页面。
Look package and tests for examples:
查看包和测试示例：
use WebExtractor\DataExtractor\DataExtractorFactory; use WebExtractor\DataExtractor\DataExtractorTypes; use WebExtractor\Client\Client;
$factory = DataExtractorFactory::getFactory(); $extractor = $factory->createDataExtractor(DataExtractorTypes::CSS); $client = new Client; $content = $client->get('https://en.wikipedia.org/wiki/2014_Winter_Olympics'); $extractor->setContent($content); $h1 = $extractor->setSelector('h1')->extract();
使用 WebExtractor\DataExtractor\DataExtractorFactory; 使用 WebExtractor\DataExtractor\DataExtractorTypes; 使用 WebExtractor\Client\Client;
$factory = DataExtractorFactory::getFactory(); $extractor = $factory->createDataExtractor(DataExtractorTypes::CSS); $client = 新客户；$content = $client->get(' https://en.wikipedia.org/wiki/2014_Winter_Olympics'); $extractor->setContent($content); $h1 = $extractor->setSelector('h1')->extract();
