SimpleXMLElement::addChild

(PHP 5 >= 5.1.3, PHP 7, PHP 8)

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

说明

public SimpleXMLElement::addChild(string $qualifiedName, ?string $value = null, ?string $namespace = null): ?SimpleXMLElement

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

参数

qualifiedName: 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 on success; null on failure.

示例

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

示例 #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();

?>

以上示例的输出类似于：

<?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::addAttribute() - Adds an attribute to the SimpleXML element
Basic SimpleXML usage

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用户贡献的备注 6 notes

down

frosty dot z at freesbee dot fr ¶

11 years ago

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

down

alex dot feraud at gmail dot com ¶

13 years ago

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)

  {

   $node= dom_import_simplexml($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);

            }

        }

    }

}

?>

down

johninen at gmail dot com ¶

9 years ago

In the docs for google sitemaps it is required an element for mobile sitemaps that looks like this: <mobile:mobile/>

I used some time to figure out how to make it, but it is quite simple when understood.

$mobile_schema = 'http://www.google.com/schemas/sitemap-mobile/1.0';

//Create root element
$xml_mobile = new SimpleXMLElement('
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:mobile="'.$mobile_schema.'"></urlset>
');

//Add required children
$url_mobile = $xml_b_list_mobile->addChild('url');
$url_mobile->addChild('loc', 'your-mobile-site-url');
$url_mobile->addChild('mobile:mobile', null, $mobile_schema);

For this to work properly the attribute xmlns:mobile must be set in the root node, and then used as namespace(third argument) when creating the mobile:mobile child with null as value.

down

nwarap ¶

7 years ago

Want to continue the ampersand (&) chain problem.

Sometimes, you would want to assign  (=) addChild.
This trick will helps you to do this.

<?php
$webOrders = new SimpleXMLElement('<?xml version="1.0"?><WebOrders></WebOrders>');
$webOrder = $webOrders->addChild('WebOrder');
$product = $webOrder->addChild('Product');
$product[0] = 'T&M';
$product->addAttribute('price', 19.99);
$product->addAttribute('qty', 2);
var_dump($webOrders->asXML());
?>

OUTPUT would be:

<?xml version="1.0" encoding="UTF-8"?>
<WebOrders>
    <WebOrder>
        <Product price="19.99" qty="2">T&amp;M</Product>
    </WebOrder>
</WebOrders>

down

Volker Grabsch ¶

13 years ago

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.

down

fluxlicious at gmail dot com ¶

1 year ago

The class below allows you to write CDATA and to add additional attributes.

<?php
class SimpleXMLElementExtended extends \SimpleXMLElement
{
    public function addChildWithCData($name, $value)
    {
        $child = parent::addChild($name);
        $element = dom_import_simplexml($child);
        $docOwner = $element->ownerDocument;
        $element->appendChild($docOwner->createCDATASection($value));
        return $child;
    }
}
?>

Example:
<?php
        $xml = new SimpleXMLElementExtended('<xml></xml>');
        $content = $xml->addChildWithCData('content', 'Title of the page');
        $content->addAttribute('id', 1);
        $content->addAttribute('enabled', 'true');

        // Output:
        // <xml>
        //   <content id="1" enabled="true"><![CDATA[Title of the page]]></content>
        // </xml>
?>