How do I read values from a .GPX file in PHP?

I have a problem that I have been trying to solve for two days now and I can't find the information I need to solve it. What I want to do is take the lat, lon and ele values from a .gpx file and put them into a table. I made pages to let users upload the gpx files onto the server. I then make a new table called one, two, three etc. the next number in line in my database called 'vluchten'. The table has fields for lat, lon and ele, all doubles. Now I need to open any .gpx file that a user might upload and extract the lats, lons and eles into my table. I have already looked into using the php filesystem functions (fopen, fseek, etc.) but they don't seem to be usefull for my needs. I also tried reading it as an XML which didn't work either. (maybe I made mistakes)

Any suggestions on how I might be able to take values from gpx files and put them in a database table are very welcome! The PHP page will receive the table name that the lat, lon and ele need to go into in a $_POST['name'].

So in short my question is: How do I take lon, lat and ele out of a .gpx and put them in a table using SQL?

Thanks in advance, Jelle