使用 PHP 从网页中提取特定数据
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Extracting specific data from a web page using PHP
提问by Daniel Silva
Possible Duplicate:
HTML Scraping in Php
可能的重复：
PHP 中的 HTML Scraping
I would like to know if is there any way to get from a webpage a specific string of text wich is updated every now and then using PHP. I′ve searched "all over the internet" and have found nothing. Just saw that preg_match could do it, but I didn't understand how to use it.
我想知道是否有任何方法可以从网页中获取特定的文本字符串，该字符串会时不时地使用 PHP 进行更新。我搜索了“整个互联网”，但一无所获。刚刚看到 preg_match 可以做到，但我不明白如何使用它。
imagine that a webpage contains this:
想象一个网页包含以下内容：
<div name="changeable_text">**GET THIS TEXT**</div>
How can I do it using PHP, after having used file_get_contentsto put the page in a variable?
在过去file_get_contents将页面放入变量后，如何使用 PHP来实现？
Thanks in advance :)
提前致谢 ：）
回答by nickb
You can use DOMDocument, like this:
你可以使用DOMDocument，像这样：
$html = file_get_contents( $url);
libxml_use_internal_errors( true);
$doc = new DOMDocument;
$doc->loadHTML( $html);
$xpath = new DOMXpath( $doc);
// A name attribute on a <div>???
$node = $xpath->query( '//div[@name="changeable_text"]')->item( 0);
echo $node->textContent; // This will print **GET THIS TEXT**
回答by Kai Mattern
You might want to have a look at the
你可能想看看
Simple HTML DOM Library
简单的 HTML DOM 库
There is a little tutorial here: http://www.developertutorials.com/tutorials/php/easy-screen-scraping-in-php-simple-html-dom-library-simplehtmldom-398/
这里有一个小教程：http: //www.developertutorials.com/tutorials/php/easy-screen-scraping-in-php-simple-html-dom-library-simplehtmldom-398/
That one is a screen scraping API that lets you feed html to it and then get parts of it in a jQuery similiar language.
那是一个屏幕抓取 API，可让您将 html 提供给它，然后以 jQuery 类似语言获取其中的一部分。
回答by Celeritas
You're talking about data scraping: the act of extracting data from a human readable output. In your case this is whatever is between the <div>tags. Use PHP DOM's extension to get to the tag you want and extract data. Google search for a PHP DOM tutorial.
你说的是数据抓取：从人类可读的输出中提取数据的行为。在您的情况下，这是<div>标签之间的任何内容。使用PHP DOM的扩展来获取您想要的标签并提取数据。谷歌搜索 PHP DOM 教程。
回答by spiralclick
$delements= file_get_html('url will go here');
foreach($elements->find('element') as $ele) {
? //traverse according to your preferences
}
//return or output
