How to merge two xml files?

[etrader]

I have loaded two similar xml files by simplexml_load_file, and I want to merge them. They have similar structure and I want to put them into a single xml.

 

As a matter of fact, I have parse two similar xml files with foreach, and now I want to put them together and use one foreach for the merged xml. I hope to find a function like array_merge()

 

[Adam]

There's no such function unfortunately, probably because the structure of an XML document can vary so much. What you could do is get all the children of the first structure's root element, and append them to the root element of the second structure's (or vice-versa).