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：

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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:

// 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:

// 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?

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:

$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";
}

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

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 .