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php simple_html_dom 使用

admin 11月 11, 2020 0


简单范例
image

DOM的方法

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$html = file_get_html('http://www.google.com/');        
$html->clear() ;                                        //调用方法

DOM methods & properties

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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

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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]');

  1. Element 的方法
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    $e = $html->find("div", 0);                              //$e 所拥有的方法如下表所示

Attribute Name Usage:

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$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

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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:

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echo $html->find("#div1", 0)->children(1)->children(1)->children(2)->id;

// or 
```php
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

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// Write a function with parameter "$element"
function ($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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