<?php
$xml = <<<XML
<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<firstname>My name is WHAT <inner>the fuck</inner></firstname>
<lastname>My name is WHO</lastname>
<body>My name is CHIKA CHIKA Slim-Shady</body>
</note>
XML;
$x = simplexml_load_string($xml);
var_dump(implode(' ', $x->xpath('/note/body//*')));