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使用php simple html dom parser解析html标签_PHP教程

WBOY
WBOYOriginal
2016-07-14 10:07:221392Durchsuche

 
 
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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Php代码 // 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 . '
';     
   
// Extract images    
foreach($html->find('img') as $element)    
       echo $element->src . '
';  
[php] 
// Create DOM from URL or file   
$html = file_get_html('http://www.microsoft.com/');  
// Extract links   
foreach($html->find('a') as $element)  
       echo $element->href . '
';   
// Extract images   
foreach($html->find('img') as $element)  
       echo $element->src . '
';  
 
// Create DOM from URL or file
$html = file_get_html('http://www.microsoft.com/');
// Extract links
foreach($html->find('a') as $element)
       echo $element->href . '
'; 
// Extract images
foreach($html->find('img') as $element)
       echo $element->src . '
';
The parser can also be used to modify HTML elements:
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Php代码 // Create DOM from string    
$html = str_get_html('
Simple
Parser
');    
   
$html->find('div', 1)->class = 'bar';    
   
$html->find('div[id=simple]', 0)->innertext = 'Foo';    
   
// Output:
Foo
Parser
   
echo $html;  
[php] 
// Create DOM from string   
$html = str_get_html('
Simple
Parser
');  
$html->find('div', 1)->class = 'bar';  
$html->find('div[id=simple]', 0)->innertext = 'Foo';  
// Output:
Foo
Parser
  
echo $html;  
 
// Create DOM from string
$html = str_get_html('
Simple
Parser
');
$html->find('div', 1)->class = 'bar';
$html->find('div[id=simple]', 0)->innertext = 'Foo';
// Output:
Foo
Parser
echo $html;
Do you wish to retrieve content without any tags?
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Php代码 echo file_get_html('http://www.yahoo.com/')->plaintext;  
[php] 
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 ([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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Php代码 $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."
\n";    
}  
[php] 
$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."
\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."
\n";
}NOTE Make sure to include the parser before using any functions of it:
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Php代码 
include 'simple_html_dom.php';  
[php] 
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: [url]
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