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
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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;