使用php simple html dom parser解析html标签

Posted 2020-06-20 绿尘枫

转自：http://www.blhere.com/1243.html

使用php simple html dom parser解析html标签
用了一下
PHP Simple HTML DOM Parser
解析HTML页面，感觉还不错，它能创建一个DOM tree方便你解析html里面的内容。用来抓东西挺好的。

附带一个例子，你也到sourceforge下载压缩包看里面的例子：
Scraping data with PHP Simple HTML DOM Parser

PHP Simple HTML DOM Parser , written in PHP5+, allows you to manipulate HTML in a very easy way. Supporting invalid HTML, this parser is better then other PHP scripts using complicated regexes to extract information from web pages.
Before getting the necessary info, a DOM should be created from either URL or file. The following script extracts links & images from a website:
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// Create DOM from URL or file   $html = file_get_html(‘http://www.microsoft.com/‘);     // Extract links   foreach($html->find(‘a‘) as $element)          echo $element->href . ‘<br>‘;       // Extract images   foreach($html->find(‘img‘) as $element)          echo $element->src . ‘<br>‘;

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// Create DOM from URL or file $html = file_get_html(‘http://www.microsoft.com/‘); // Extract links foreach($html->find(‘a‘) as $element)        echo $element->href . ‘<br>‘; // Extract images foreach($html->find(‘img‘) as $element)        echo $element->src . ‘<br>‘;

The parser can also be used to modify HTML elements:
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// Create DOM from string   $html = str_get_html(‘<div id="simple">Simple</div><div id="parser">Parser</div>‘);     $html->find(‘div‘, 1)->class = ‘bar‘;     $html->find(‘div[id=simple]‘, 0)->innertext = ‘Foo‘;     // Output: <div id="simple">Foo</div><div id="parser" class="bar">Parser</div>   echo $html;

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// Create DOM from string $html = str_get_html(‘<div id="simple">Simple</div><div id="parser">Parser</div>‘); $html->find(‘div‘, 1)->class = ‘bar‘; $html->find(‘div[id=simple]‘, 0)->innertext = ‘Foo‘; // Output: <div id="simple">Foo</div><div id="parser" class="bar">Parser</div> echo $html;

Do you wish to retrieve content without any tags?
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1	echo file_get_html(‘http://www.yahoo.com/‘)->plaintext;

1	echo file_get_html(‘http://www.yahoo.com/‘)->plaintext;

In the package files of this parser ([url]http://simplehtmldom.sourceforge.net/[/url]) you can find some scraping examples from digg, imdb, slashdot. Let’s create one that extracts the first 10 results (titles only) for the keyword “php” from Google:
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$url = ‘http://www.google.com/search?hl=en&q=php&btnG=Search‘;     // Create DOM from URL   $html = file_get_html($url);     // Match all ‘A‘ tags that have the class attribute equal with ‘l‘   foreach($html->find(‘a[class=l]‘) as $key => $info)   {   echo ($key + 1).‘. ‘.$info->plaintext."<br />\n";   }

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$url = ‘http://www.google.com/search?hl=en&q=php&btnG=Search‘; // Create DOM from URL $html = file_get_html($url); // Match all ‘A‘ tags that have the class attribute equal with ‘l‘ foreach($html->find(‘a[class=l]‘) as $key => $info) { echo ($key + 1).‘. ‘.$info->plaintext."<br />\n"; }

NOTE Make sure to include the parser before using any functions of it:
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Php代码

1	include ‘simple_html_dom.php‘;

1	include ‘simple_html_dom.php‘;

For more information regarding the usage of this function consider checking the ‘PHP Simple HTML Dom Parser’ Manual. To download the package files use the following URL: [下载]