xml parsing

I am kind of new at PHP, but have a good background in programming, so I am
catching on quick. One thing I am trying to do is parse xml, similar to
xslt, but without an xml parser such as Sablotron, so I am pretty much only
using core PHP.

The only problem I am having right now is how to divide up a line of the xml
file. Currently I have loaded the file into an array using file(). I need to
separate the following line, for example:

<htitle>Welcome to SpanglerCo<login> <lname/></login></htitle>

into an array with [<htitle>,Welcome to
SpanglerCo,<login>,<lname/>,</login>,</htitle>] or something similar (or
better).

I would appreciate any help.

Thank you,

Paul Spangler
SpanglerCo