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simple_html_dom使用小结

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 . '<br>';

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

// 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('<div id="hello">Hello</div><div id="world">World</div>'); $html->find('div', 1)->class = 'bar';

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

echo $html; // Output: <div id="hello">foo</div><div id="world" class="bar">World</div>

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

// Find all <div> 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 <li> in <ul> 
$es = $html->find('ul li');

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

// Find all <td> in <table> which 
$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("<div>foo <b>bar</b></div>"); 
$e = $html->find("div", 0);
echo $e->tag; // Returns: " div"
echo $e->outertext; // Returns: " <div>foo <b>bar</b></div>"
echo $e->innertext; // Returns: " foo <b>bar</b>"
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($element) {
        // Hide all <b> tags 
        if ($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;

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