simple_html_dom使用小结

2022-05-10 00:11:51

simple_html_dom使用小结

分类： PHP2012-08-31 14:24 3094人阅读评论(0) 收藏举报

html callback string div function file

1.文件夹结构如下：

php解析html页面工具 simple html dom 使用的简单介绍：
（1）下载（ http://sourceforge.net/projects/simplehtmldom/files/）；

（2）解压，manual目录是使用文档（很容易看懂的，也可以看这里http://simplehtmldom.sourceforge.net/），example目录是一些实例，可以参考使用；

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 . '<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;

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simple_html_dom使用小结

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