SimpleXml and php Iteration

I've been looking at the other questions posted here on this subject but they all seem to have in common a "symetric" xml file.

I start by calling:

$xml_testimonials=simplexml_load_file("bck/testimonials.xml");

I cant iterate this file:

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

<testimonials>

<description><![CDATA[
<p>Give us your feeback!</p>
 ]]></description>

<testimonials_collection>

<testimonial>
<testimonial_name>
Dummy Name
</testimonial_name>
<testimonial_content>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed nec libero venenatis, posuere massa     vitae, volutpat massa. Maecenas placerat ac metus ut pulvinar.
</testimonial_content>
</testimonial>

<testimonial>
<testimonial_name>
Dummy Name
</testimonial_name>
<testimonial_content>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed nec libero venenatis, posuere massa     vitae, volutpat massa. Maecenas placerat ac metus ut pulvinar.
</testimonial_content>
</testimonial> 

<testimonial>
<testimonial_name>
 Dummy Name
</testimonial_name>
<testimonial_content>
 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed nec libero venenatis, posuere massa vitae, volutpat massa. Maecenas placerat ac metus ut pulvinar.
 </testimonial_content>
 </testimonial>

 </testimonials_collection>

 </testimonials>

Im trying to use:

foreach($xml_testimonials->testimonials->testimonials_collection as $testimonial) {
    print $testimonial->testimonial->testimonial_name;
}

and Im getting

Warning: Invalid argument supplied for foreach()

Also is there anyway that I can avoid using and retain the html tags?