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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comments
<!----> 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'
, 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', 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'
)
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') 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
.
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