ow can I get the unique nodeNames into an array?

I have an XML like this in my Codeigniter project

Code:

<myitems>
 <myitem>
   <myname>Some Name</myname>
   <myphone>4444444</myphone>
 </myitem>
 <myitem>
   <myname>Some other Name</myname>
   <myphone>8888888</myphone>
 </myitem>
</myitems>

How can I get the unique nodeNames into an array, like array("myname","myphone") ?

PHP.NET - xml_parse_into_struct

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