SimpleXMLElement::addAttribute

(PHP 5 >= 5.1.3)

SimpleXMLElement::addAttribute — Adds an attribute to the SimpleXML element

说明

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

Adds an attribute to the SimpleXML element.

参数

name: The name of the attribute to add.
value: The value of the attribute.
namespace: If specified, the namespace to which the attribute belongs.

返回值

没有返回值。

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::addChild() - Adds a child element to the XML node
Basic SimpleXML usage

用户评论:

[#1] p.servus [2011-11-18 17:42:48]

If you need an Namespace, you must write a Prefix of the Namespace + the Name of the Attribute ("prefix:name") as the first parameter AND the uri as the third one. (I don't know why?!)

Example code:
<?php $xml = new SimpleXMLElement("<packagedElement></packagedElement>"); $xml->addAttribute("xmi:type", "uml:Class", "http://schema.omg.org/spec/XMI/2.1"); echo $xml->asXml(); ?>

Output:
<packagedElement xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" xmi:type="uml:Class"></packagedElement>

[#2] sarlak [2011-05-07 07:49:11]

You can access a node child with his name this way :

<?php $root = new SimpleXMLElement($filePath); echo $root->nodeName->attributes; // It works recursivly so this will work too echo $root->nodeName->subNodeName->attributes(); ?>

But if you want to ADD an attribute to a children you MUST use the children() method to access and modfiy it or it will modify the parent's attributes.

<?php // Add a subnode $element->nodeName->addChild('subNodeName', "whatever you want"); // Get the pos in the childrens of the parent node $lastNodePos = $element->nodeName->count()-1; // Get the parents node childrens $nodeChildrens = $element->nodeName->children(); // Add an attribute to the last created $nodeChildrens[$lastNodePos]->addAttribute('attributeName', "The attribute value); ?>

[#3] booleer at yahoo dot it [2010-12-16 09:44:56]

If the attribute already exists, addAttribute does nothing.

example:
<?php $xml_string = <<<XML <?xml version="1.0" encoding="UTF-8"?>
<root>
<item id="foo">
<root>
XML;

$xml = simplexml_load_string($xml_string);
$xml->item->addAttribute('id', 'bar');
echo $xml->asXML();
?>

The above examples will output:
<?phpxml version="1.0" encoding="UTF-8"?>
<root>
<item id="foo">
<root>