使用php simple html dom parser解析html标签

 

使用php simple html dom parser解析html标签

用了一下 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：   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: view plain copy to clipboard print ?   Php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>";  

// 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: view plain copy to clipboard print ?   Php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;  

// 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? view plain copy to clipboard print ?   Php代码

1. 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: view plain copy to clipboard print ?   Php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 /> ";   
10. }  

$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 />
";
}

NOTE Make sure to include the parser before using any functions of it: view plain copy to clipboard print ? Php代码

1. 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]