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:
 
Php代码 复制代码
  1. // Create DOM from URL or file   
  2. $html = file_get_html('http://www.microsoft.com/');   
  3.   
  4. // Extract links   
  5. foreach($html->find('a'as $element)   
  6.        echo $element->href . '<br>';    
  7.   
  8. // Extract images   
  9. foreach($html->find('img'as $element)   
  10.        echo $element->src . '<br>';  
The parser can also be used to modify HTML elements:
 
Php代码 复制代码
  1. // Create DOM from string   
  2. $html = str_get_html('<div id="simple">Simple</div><div id="parser">Parser</div>');   
  3.   
  4. $html->find('div', 1)->class = 'bar';   
  5.   
  6. $html->find('div[id=simple]', 0)->innertext = 'Foo';   
  7.   
  8. // Output: <div id="simple">Foo</div><div id="parser" class="bar">Parser</div>   
  9. echo $html;  
Do you wish to retrieve content without any tags?
 
Php代码 复制代码
  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:
 
Php代码 复制代码
  1. $url = 'http://www.google.com/search?hl=en&q=php&btnG=Search';   
  2.   
  3. // Create DOM from URL   
  4. $html = file_get_html($url);   
  5.   
  6. // Match all 'A' tags that have the class attribute equal with 'l'   
  7. foreach($html->find('a[class=l]'as $key => $info)   
  8. {   
  9. echo ($key + 1).'. '.$info->plaintext."<br />\n";   
  10. }  
NOTE Make sure to include the parser before using any functions of it:
Php代码 复制代码
  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: [url]http://sourceforge.net/project/showfiles.php?group_id=218559[/url] .