[英]how to use dom php parser
我是PHP的DOM解析新手：
我有一个我正在尝试解析的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">
......
我正在尝试使用php获取许多div框的内容。 如何使用DOM解析器执行此操作？
谢谢！
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; 有关于这一点的课程。 每个元素都应该有唯一的id。
使用id =“interestingbox”获取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
}
类的示例：
$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
}
有关更多详细信息，请参阅DOMXPath页面。
我使用simplehtmldom作为开始使用它 ：
$html = file_get_html('example.com');
foreach ($html->find('div[id=interestingbox]') as $result)
{
echo $result->innertext;
}
function innerXML($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 />"
WebExtractor： https ： //github.com/knyga/webextractor它可以使用css，regex，xpath选择器解析页面。
查看包和测试示例：
使用WebExtractor \\ DataExtractor \\ DataExtractorFactory; 使用WebExtractor \\ DataExtractor \\ DataExtractorTypes; 使用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（$内容）; $ h1 = $ extractor-> setSelector（'h1'） - > extract（）;
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