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simple_html_dom使用小结

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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 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


(


“<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;