使用php simple html dom parser解析html标签

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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：



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Scraping data with PHP Simple HTML DOM Parser


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<!---->　　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>'
  ;  
  
  

// 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
  ;  
  
  

// 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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• echo
   file_get_html(
  'http://www.yahoo.com/'
  )->plaintext;  
  
  

echo file_get_html('http://www.yahoo.com/')->plaintext;
　　In the package files of this parser
(http://simplehtmldom.sourceforge.net/) 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"
  ;  
  
  
• }  
  

$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";
}
　　NOTEMake sure to include the parser before using any functions of it:

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• include
   
  'simple_html_dom.php'
  ;  
  
  

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: http://sourceforge.net/project/showfiles.php?group_id=218559
.