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[工具应用] simple htm dom php使用详解

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发表于 2015-8-19 23:43:03 | 显示全部楼层 |阅读模式
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
NameDescription
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 class=hello
$es = $html->find('table.hello td');

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





5. Element 的方法


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


Attribute NameUsage
$e->tagRead or write the tag name of element.
$e->outertextRead or write the outer HTML text of element.
$e->innertextRead or write the inner HTML text of element.
$e->plaintextRead 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



MethodDescription
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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