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simplexml_import_dom

(PHP 5, PHP 7)

simplexml_import_dom — Get a SimpleXMLElement object from a DOM node

说明

simplexml_import_dom ( DOMNode $node [, string $class_name = "SimpleXMLElement" ] ) : SimpleXMLElement

This function takes a node of a DOM document and makes it into a SimpleXML node. This new object can then be used as a native SimpleXML element.

参数

node: A DOM Element node
class_name: You may use this optional parameter so that simplexml_import_dom() will return an object of the specified class. That class should extend the SimpleXMLElement class.

返回值

Returns a SimpleXMLElement 或者在失败时返回 FALSE.

Warning

此函数可能返回布尔值 FALSE，但也可能返回等同于 FALSE 的非布尔值。请阅读布尔类型章节以获取更多信息。应使用 === 运算符来测试此函数的返回值。

范例

Example #1 Importing DOM


<?php
$dom = new DOMDocument;
$dom->loadXML('<books><book><title>blah</title></book></books>');
if (!$dom) {
    echo 'Error while parsing the document';
    exit;
}

$s = simplexml_import_dom($dom);

echo $s->book[0]->title;
?>

以上例程会输出：

blah

参见

dom_import_simplexml() - Gets a DOMElement object from a SimpleXMLElement object
Basic SimpleXML usage

User Contributed Notes

shirkaen at gmail dot com 10-Nov-2016 06:58


/*If tags in DOM have text and some part of this text is surrounded by other tag, simple_import_dom object doesn't contain position of child tag, so rendering it back to html/xml can be a problem. Printing such a node is also peculiar. Eg.*/



//////////////////////

$text = "<body><p>Some text before <em>italic </em>and after text.</p></body>";

$dom = new DOMDocument;

$dom->loadHTML($text);

$result = simplexml_import_dom($dom);

echo $result->p;



//////////////////////

//Prints :

//Some text before and after text.



print_r($result->p);

//Prints:

//SimpleXMLElement Object ( [em] => italic )



print_r($result->p->em)

//does more or less the same:

//SimpleXMLElement Object ( [0] => italic )



var_dump($result->p);

//Prints:

//object(SimpleXMLElement)#8 (1) { ["em"]=> string(7) "italic " }



var_dump($result->p->em)

//object(SimpleXMLElement)#9 (1) { [0]=> string(7) "italic " }



//but

echo $result->p->em;

//prints:

//italic

brandonkirsch at perceptionilluminates dot com 14-Aug-2013 03:38


simplexml_import_dom() will accept DOMNodes or other SimpleXMLElements.  This has a useful purpose if you are extending the SimpleXMLElement class and would prefer the xpath() method to return your class extension instead of basic SimpleXMLElements.  For example:



class MySimpleXML extends SimpleXMLElement{

    public function xpath($xpath){ 

        $return = array();

        $simpleXmls = parent::xpath($xpath); // run SimpleXMLElement xpath, returning an array of SimpleXMLElements

        foreach($simpleXmls as $xml){

            $return[] = simplexml_import_dom($xml,'MySimpleXML'); // copy SimpleXMLElement, returning as MySimpleXML instance

        }

        return $return;

    }

}



Now I can create an instance of MySimpleXML, run an xpath, and get my results back as an array of MySimpleXML elements instead of the native SimpleXMLElement:



$mySimpleXml = new mySimpleXml('<root><node/></root>');



$array = $mySimpleXml->xpath('/root/node'); // returns array with a single MySimpleXml object

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simplexml_import_dom

说明

参数

返回值

范例

参见

User Contributed Notes

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