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(PHP 5, PHP 7)
DOMAttr::__construct — Creates a new DOMAttr object
$name 
   [,  string $value 
  ] )Creates a new DOMAttr object. This object is read only. It may be appended to a document, but additional nodes may not be appended to this node until the node is associated with a document. To create a writable node, use DOMDocument::createAttribute.
name The tag name of the attribute.
value The value of the attribute.
Example #1 Creating a new DOMAttr object
  <?php
$dom  = new  DOMDocument ( '1.0' ,  'iso-8859-1' );
 $element  =  $dom -> appendChild (new  DOMElement ( 'root' ));
 $attr  =  $element -> setAttributeNode (new  DOMAttr ( 'attr' ,  'attrvalue' ));
echo  $dom -> saveXML (); 
 ?>   以上例程会输出:
<?xml version="1.0" encoding="utf-8"?> <root attr="attrvalue" />
[#1] Anonymous [2014-09-18 22:48:04]
The output should be:
<?phpxml version="1.0" encoding="iso-8859-1"?>
<root attr="attrvalue"/>