使用php simple html dom parser解析html标签

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 /> ";
}

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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 /> ";
}

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]