Implementation code for parsing html with php_PHP tutorial-PHP Tutorial-php.cn

Recently, I want to use PHP to write a crawler, which requires parsing HTML. I found a project called PHP Simple HTML DOM Parser on sourceforge. It can return specified DOM elements through a CSS selector in a jQuery-like way. It is very powerful.
First, introduce the file simple_html_dom.php at the beginning of the program

Copy the code The code is as follows:

include_once(' simple_html_dom.php');

PHP Simple HTML DOM Parser provides 3 ways to create DOM objects

Copy code Code As follows:

 
// Create a DOM object from a string 
$html = str_get_html('Hello!' ); 
// Create a DOM object from a URL 
$html = file_get_html('http://www.google.com/'); 
// Create a DOM object from a HTML file 
$html = file_get_html('test.htm'); 

After getting the DOM object, you can perform various operations

Copy code The code is as follows:

// Find all anchors, returns an 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

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

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

You can use various css selectors here, just like DOM operations in jQuery, which is very convenient. In addition, there are two special attributes to get the content of text and comments

Copy code The code is as follows:

 
// Find all text blocks 
$es = $html->find('text'); 
// Find all comment () blocks 
$es = $html->find('comment'); 

Of course, similar to jQuery, PHP Simple HTML DOM Parser also supports chain operations and various simple methods of accessing DOM elements

Copy code The code is as follows:

 
// 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'); 

Related labels：

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source：php.cn

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