PHP addAttribute() 函数
实例
给根元素和 body 元素添加一个属性：
<?php
$note=<<<XML
<note>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
XML;
$xml=new SimpleXMLElement($note);
$xml->addAttribute(type,private);
$xml->body->addAttribute(date,2013-0
