I found (here) an answer regarding the way to delete a node of a SimpleXMLElement object.
The problem is I can not really understand how is that happening.
I mean, that $image var is a ref, right? So, what and where it is that $image[0][0]?
SimpleXMLElement presents an array-like interface on its child nodes via magic methods. This behavior is because of custom __unset behavior that causes the SimpleXMLElement to act as though a "member" (child element) of its "array" (set of child elements) has been removed.
If you put a print_r($image) right after the $image = $galleries->xpath(...
you'll see:
Array
(
[0] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Hansio
)
)
)