Your host probably runs PHP4 and PHP5 at the same time, yes it's possible, but sometimes annoying when working with PHP5, as PHP4 is dominant over the .php extension.

Try renaming your file to <name>.php5, and see if you still get the errors, if you don't, make a file over the FTP called ".htaccess", and add the following content into it:

Now you can work with PHP5 and the .php extension at the same time