SimpleXMLElement::addAttribute

(PHP 5 >= 5.1.3, PHP 7)

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

User Contributed Notes

Patanjali 10-Apr-2016 07:37


You cannot use this to update an existing attribute's value.



Instead, get a DOM version of the SimpleXMLElement and use setAttribute, as per:



$XML = '<element a="aa">Text</element>';

$snode = new simple_xml_element($XML);



$dnode = dom_import_simplexml($snode);

$dnode->setAttribute('a', 'bb');



Resulting XML for the node is:

<element a="bb">Text</element>

p.servus 19-Nov-2011 02:42


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>

sarlak 07-May-2011 04:49


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);

?>

booleer at yahoo dot it 16-Dec-2010 06:44


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:

<?xml version="1.0" encoding="UTF-8"?>

<root>

   <item id="foo">

<root>