simple_html_dom使用小结

 1.文件夹结构如下：

manual           手册文件夹，重点看懂这手册即可

2.简单范例

php

include "simple_html_dom.php" ; // Create DOM from URL or file
$html = file_get_html('http://www.google.com/');

// Find all images 
foreach($html->find('img') as $element) 
       echo $element->src . '
';

// Find all links 
foreach($html->find('a') as $element) 
       echo $element->href . '
';

// Create DOM from URL
$html = file_get_html('http://slashdot.org/');

// Find all article blocks
foreach($html->find('div.article') as $article) {
    $item['title']     = $article->find('div.title', 0)->plaintext;
    $item['intro']    = $article->find('div.intro', 0)->plaintext;
    $item['details'] = $article->find('div.details', 0)->plaintext;
    $articles[] = $item;
}

print_r($articles);

// Create DOM from string
$html = str_get_html('

Hello

World

'); $html->find('div', 1)->class = 'bar';

$html->find('div[id=hello]', 0)->innertext = 'foo';

echo $html; // Output:

foo

class="bar">World

3.DOM的方法

$html =  file_get_html ( 'http://www.google.com/' );        // $html 所拥有的方法如下表所示

$html->clear() ;                                                              // 调用方法

DOM  methods & properties 

Name	Description
void __construct ( [string $filename] )	Constructor, set the filename parameter will automatically load the contents, either text or file/url.
string plaintext	Returns the contents extracted from HTML.
void clear ()	Clean up memory.
void load ( string $content )	Load contents from a string.
string save ( [string $filename] )	Dumps the internal DOM tree back into a string. If the $filename is set, result string will save to file.
void load_file ( string $filename )	Load contents from a from a file or a URL.
void set_callback ( string $function_name )	Set a callback function.
mixed find ( string $selector [, int $index] )	Find elements by the CSS selector. Returns the Nth element object if index is set, otherwise return an array of object.

4.find 方法详细介绍

find ( string $selector [, int $index] ) 

// Find all anchors, returns a array of element objects
$ret = $html->find( 'a' );

// Find (N)th anchor, returns element object or null if not found   (zero based)
$ret = $html->find( 'a', 0 );

// Find lastest anchor, returns element object or null if not found   (zero based)
$ret = $html->find( 'a', -1 ); 

// Find all 

 with the id attribute
$ret = $html->find( 'div[id]' );

// Find all 

 which attribute id=foo
$ret = $html->find( 'div[id=foo]' ); 

// Find all element which id=foo
$ret = $html->find( '#foo' );

// Find all element which class=foo
$ret = $html->find( '.foo' );

// Find all element has attribute id
$ret = $html->find( '*[id]' ); 

// Find all anchors and images 
$ret = $html->find( 'a, img' ); 

// Find all anchors and images with the "title" attribute
$ret = $html->find( 'a[title], img[title]' );

// Find all

in

 
$es = $html->find( 'ul li' );

// Find Nested
  tags
$es = $html->find( 'div div div' ); 

// Find all in which class=hello 
$es = $html->find('table.hello td');

// Find all td tags with attribite align=center in table tags 
$es = $html->find(''table td[align=center]');







5. Element  的方法




$e = $html->find( "div" ,  0 );                              // $e 所拥有的方法如下表所示




Attribute Name	Usage
$e->tag	Read or write the tag name of element.
$e->outertext	Read or write the outer HTML text of element.
$e->innertext	Read or write the inner HTML text of element.
$e->plaintext	Read or write the plain text of element.



// Example
$ html =  str_get_html ( "
foo bar
" ) ;  
$e = $html->find( "div" ,  0 );

echo $e-> tag ;  // Returns: " div"
echo $e-> outertext ;  // Returns: " 
foo bar
"
echo $e-> innertext ;  // Returns: " foo bar"
echo $e-> plaintext ;  // Returns: " foo bar"


6.DOM traversing 方法



Method	Description
mixed $e->children ( [int $index] )	Returns the Nth child object if index is set, otherwise return an array of children.
element $e->parent ()	Returns the parent of element.
element $e->first_child ()	Returns the first child of element, or null if not found.
element $e->last_child ()	Returns the last child of element, or null if not found.
element $e->next_sibling ()	Returns the next sibling of element, or null if not found.
element $e->prev_sibling ()	Returns the previous sibling of element, or null if not found.



// Example
echo $html-> find ( "#div1", 0 )-> children ( 1 )-> children ( 1 )-> children ( 2 )-> id ;
// or  
echo $html-> getElementById ( "div1" )-> childNodes ( 1 )-> childNodes ( 1 )-> childNodes ( 2 )-> getAttribute ( 'id' );




    附带： DOM方法   set_callback ( 'my_callback' )  使用方法


// Write a function with parameter "$element"
function my_callback( $element ) {
         // Hide all tags 
        if ($element->tag== 'b' )
                $element->outertext = '';
} 

// Register the callback function with it's function name
$html-> set_callback ( 'my_callback' );

// Callback function will be invoked while dumping
echo $html;