SimpleXMLElement
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SimpleXMLElement::addChild

(PHP 5 >= 5.1.3)

SimpleXMLElement::addChild Adds a child element to the XML node

说明

public SimpleXMLElement SimpleXMLElement::addChild ( string $name [, string $value [, string $namespace ]] )

Adds a child element to the node and returns a SimpleXMLElement of the child.

参数

name

The name of the child element to add.

value

If specified, the value of the child element.

namespace

If specified, the namespace to which the child element belongs.

返回值

The addChild method returns a SimpleXMLElement object representing the child added to the XML node.

范例

Note:

Listed examples may include example.php, which refers to the XML string found in the first example of the basic usage guide.

Example #1 Add attributes and children to a SimpleXML element

<?php

include 'example.php';

$sxe = new SimpleXMLElement($xmlstr);
$sxe->addAttribute('type''documentary');

$movie $sxe->addChild('movie');
$movie->addChild('title''PHP2: More Parser Stories');
$movie->addChild('plot''This is all about the people who make it work.');

$characters $movie->addChild('characters');
$character  $characters->addChild('character');
$character->addChild('name''Mr. Parser');
$character->addChild('actor''John Doe');

$rating $movie->addChild('rating''5');
$rating->addAttribute('type''stars');
 
echo 
$sxe->asXML();

?>

以上例程的输出类似于:

<?xml version="1.0" standalone="yes"?>
<movies type="documentary">
 <movie>
  <title>PHP: Behind the Parser</title>
  <characters>
   <character>
    <name>Ms. Coder</name>
    <actor>Onlivia Actora</actor>
   </character>
   <character>
    <name>Mr. Coder</name>
    <actor>El Act&#xD3;r</actor>
   </character>
  </characters>
  <plot>
   So, this language. It's like, a programming language. Or is it a
   scripting language? All is revealed in this thrilling horror spoof
   of a documentary.
  </plot>
  <great-lines>
   <line>PHP solves all my web problems</line>
  </great-lines>
  <rating type="thumbs">7</rating>
  <rating type="stars">5</rating>
 </movie>
 <movie>
  <title>PHP2: More Parser Stories</title>
  <plot>This is all about the people who make it work.</plot>
  <characters>
   <character>
    <name>Mr. Parser</name>
    <actor>John Doe</actor>
   </character>
  </characters>
  <rating type="stars">5</rating>
 </movie>
</movies>

参见


SimpleXMLElement
在线手册:中文  英文

用户评论:

frosty dot z at freesbee dot fr (2013-05-16 14:31:20)

To complete Volker Grabsch's comment, stating :
"Note that although addChild() escapes "<" and ">", it does not escape the ampersand "&"."

To work around that problem, you can use direct property assignment such as :

<?php
$xmlelement
->value 'my value < > &';
// results in <value>my value &lt; &gt; &amp;</value>
?>

instead of doing :

<?php
$xmlelement
->addChild('value''my value < > &');
// results in <value>my value &lt; &gt; &</value> (invalid XML)
?>

See also: http://stackoverflow.com/questions/552957 (Rationale behind SimpleXMLElement's handling of text values in addChild and addAttribute)

HTH

passerbyxp at gmail dot com (2013-03-27 03:59:47)

Be aware that simply because you can <?php $dom->addChild();?> doesn't mean your XML is valid under simple XML itself:

<?php
$dom
=simplexml_load_string("<test></test>");
$dom->addChild("3D","1,2,3");
$xml=$dom->asXML();
echo 
$xml;
/* echos:
<?xml version="1.0"?>
<test><3D>1,2,3</3D></test>
*/

$dom=simplexml_load_string($xml);
/*
generates a whole lots of warnings,
and refuses to create an object.
*/
?>

Same in PHP 5.3 and 5.4

ivan dot kakurov at gmail dot com (2013-01-13 04:09:13)

Here's my solution for creating XML from Multidimensional Array. 
<?php
//DATA 
        
$xmlDAta = array(
            array(
                
"name"  => "nameVal",
                
"value" => "valVal",
                
"css"   => "cssVal"
            
),
            array(
                
"name"  => "name1Val",
                
"value" => "val1Val",
                
"css"   => "css1Val"
            
),
            
"tname" => array(
                array(
                    
"iTname"   => "iTname",
                    
"iTname2"  => "iTname1",
                    
"iTname2"  => "iTname2",
                    
"iTbname3" => array(
                        
"iiTbname"  => "tbName",
                        
"iiTbname1" => "tbName1",
                    ),
                ),
            ),
            
"tdata" => "otheerDAta"
        
);

   
/**
     * Create XML using string or array
     *
     * @param mixed $data input data
     * @param SimpleXMLElement $xml
     * @param string $child name of first level child
     *
     * @return adding Xml formated data into SimpleXmlElement
     */

function data2XML(array $dataSimpleXMLElement $xml$child "items")
    {

        foreach(
$data as $key => $val) {
            if(
is_array($val)) {

                if(
is_numeric($key)) {
                    
$node  $xml->addChild($child);
                    
$nodes $node->getName($child);
                } else {

                    
$node  $xml->addChild($key);
                    
$nodes $node->getName($key);
                }

                
$node->addChild($nodesself::data2Xml($val$node));
            } else {
                
$xml->addChild($key$val);
            }
        }

    }

//Use 

        
$xml    = new SimpleXMLElement("<root/>");
        
Util::data2XML($xmlDAta$xml"Items");

?>

_pilip (2012-06-20 13:14:48)

SimpleXmlElement who works with Soap with ampersand.

<?php
class SoapXMLElement extends SimpleXMLElement
{

    public function 
addChild ($key$value) {
        
$value str_replace('&''&'$value);
        
parent::addChild($key$value);
    }

}
?>

pierpaolog at gmail dot com (2012-06-06 14:33:20)

I found myself doing something like:

<?php
$cn 
$contentNode->$name;
?>

and keep getting an error message like: 

Warning: SimpleXMLElement::addChild(): Cannot add child. Parent is not a permanent member of the XML tree

I found out that what I needed to do to make the node permanent was:

<?php
$cn 
$contentNode->$name "";
$cn $contentNode->$name;
?>

hope will help someone else.

jerikojerk (2011-07-31 07:32:29)

If you're looking for a way to append children you may be interested in this:

<?php
$x 
= new SimpleXMLElement('<root name="toplevel"></root>');
$f1 = new SimpleXMLElement('<child pos="1">alpha</child>');
$f2 = new SimpleXMLElement('<child pos="2">beta</child>');
$f3 = new SimpleXMLElement('<child pos="3">gamma</child>');

$x->{$f1->getName()} = $f1;
$x->{$f2->getName()}[] = $f2;
$x->{$f3->getName()}[] = $f3;

echo 
'count child=',$x->count(),"\n";
echo 
$x->asXML();

foreach ( 
$x->children() as $foo )
{
    
var_dump($foo);
}

?>

alex dot feraud at gmail dot com (2011-06-16 02:52:34)

Here is a class with more functions for SimpleXMLElement :

<?php
/**
 *
 * Extension for SimpleXMLElement
 * @author Alexandre FERAUD
 *
 */
class ExSimpleXMLElement extends SimpleXMLElement
{
    
/**
     * Add CDATA text in a node
     * @param string $cdata_text The CDATA value  to add
     */
  
private function addCData($cdata_text)
  {
   
$nodedom_import_simplexml($this);
   
$no $node->ownerDocument;
   
$node->appendChild($no->createCDATASection($cdata_text));
  }

  
/**
   * Create a child with CDATA value
   * @param string $name The name of the child element to add.
   * @param string $cdata_text The CDATA value of the child element.
   */
    
public function addChildCData($name,$cdata_text)
    {
        
$child $this->addChild($name);
        
$child->addCData($cdata_text);
    }

    
/**
     * Add SimpleXMLElement code into a SimpleXMLElement
     * @param SimpleXMLElement $append
     */
    
public function appendXML($append)
    {
        if (
$append) {
            if (
strlen(trim((string) $append))==0) {
                
$xml $this->addChild($append->getName());
                foreach(
$append->children() as $child) {
                    
$xml->appendXML($child);
                }
            } else {
                
$xml $this->addChild($append->getName(), (string) $append);
            }
            foreach(
$append->attributes() as $n => $v) {
                
$xml->addAttribute($n$v);
            }
        }
    }
}
?>

Volker Grabsch (2011-04-21 06:17:22)

Note that although addChild() escapes "<" and ">", it does not escape the ampersand "&".
So addChild() is unsuited to handle user-defined input!
Instead, you will have to replace all "&" with "&amp;" before calling addChild().
Or, use htmlspecialchars() which also replaces other characters, but won't do any harm as addChild() won't replace those again.

felipenmoura at gmail dot com (2011-04-11 18:06:18)

This method returns a reference to the specific SimpleXMLElement.
If you use:
<?php
    $xml
= new SimpleXMLElement('<root></root>');
    
$xml->father['name']= 'Fathers name'// creates automatically a father tag with attribute name
    
$son$xml->father->addChild('son'); // uses the first father tag
    
$son['name']= 'first son';
    
$otherSon$xml->father->addChild('son'); // uses the first father tag but now, in a second son tag
    
$otherSon['name']= 'second son';
    
    echo 
htmlentities($xml->asXML());
?>

The result will be
<root>
    <father>
        <son name='first son' />
        <son name='second son' />
    </father>
</root>

So, once you change something to the just added child, you are actually accessing the element inside the SimpleXMLElement as a reference.

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