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HomeBackend DevelopmentPHP Tutorial基于simple_html_dom的使用小结_php技巧

复制代码 代码如下:

简单范例
$html = file_get_html('http://www.google.com/');  //获取html$dom = new simple_html_dom();    //new simple_html_dom对象$dom->load($html)      //加载html// Find all images foreach($dom->find('img') as $element) {   //获取img标签数组       echo $element->src . '
';    //获取每个img标签中的src}// Find all links foreach($dom->find('a') as $element){    //获取a标签的数组       echo $element->href . '
';    //获取每个a标签中的href}


$html = file_get_html('http://slashdot.org/');   //获取html$dom = new simple_html_dom();    //new simple_html_dom对象$dom->load($html);     //加载html// Find all article blocksforeach($dom->find('div.article') as $article) {       $item['title']     = $article->find('div.title', 0)->plaintext; //plaintext 获取纯文本    $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('

Hello
World
');
$dom = new simple_html_dom();     //new simple_html_dom对象

$dom->load($html);      //加载html
$dom->find('div', 1)->class = 'bar';    //class = 赋值 给第二个div的class赋值

$dom->find('div[id=hello]', 0)->innertext = 'foo';   //innertext内部文本

echo $dom;

// Output:

foo
World

 

DOM methods & properties
Name Description
void __construct ( [string $filename] ) 构造函数,将文件名参数将自动加载内容,无论是文本或文件/ url。
 string plaintext 纯文本
void clear () 清理内存
void load ( string $content ) 加载内容
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 ) 设置一个回调函数。
mixed find ( string $selector [, int $index] ) 找到元素的CSS选择器。返回第n个元素对象如果索引设置,否则返回一个数组对象。


 4.find 方法详细介绍


find ( string $selector [, int $index] )
// Find all anchors, returns a array of element objects a标签数组
$ret = $html->find('a');

// Find (N)th anchor, returns element object or null if not found (zero based)第一个a标签
$ret = $html->find('a', 0);

// Find lastest anchor, returns element object or null if not found (zero based)最后一个a标签
$ret = $html->find('a', -1);

// Find all

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

// Find all

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 a标签与img标签数组
$ret = $html->find('a, img'); 

// Find all anchors and images with the "title" attribute
$ret = $html->find('a[title], img[title]');


// Find all

  • in

      $es = $html->find('ul li'); ul标签下的li标签数组

      // Find Nested

      tags
      $es = $html->find('div div div');  div标签下div标签下div标签数组

      // Find all

      in which class=hello
      $es = $html->find('table.hello td'); table标签下td标签数组

      // 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 标签
      $e->outertext 外文本
      $e->innertext 内文本
      $e->plaintext 纯文本

       

      // Example
      $html = str_get_html("

      foo bar
      ");
      echo $e->tag; // Returns: " div"
      echo $e->outertext; // Returns: "
      foo bar
      "
      echo $e->innertext; // Returns: " foo bar"
      echo $e->plaintext; // Returns: " foo bar"

      6.DOM traversing 方法
      Method Description
      mixed$e->children ( [int $index] ) 子元素
      element$e->parent () 父元素
      element$e->first_child () 第一个子元素
      element$e->last_child () 最后一个子元素
      element$e->next_sibling () 后一个兄弟元素
      element$e->prev_sibling () 前一个兄弟元素


      // 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');


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