I am rather new to PHP so I am wondering, what is the difference between all these extensions? phtml, php3 and php .
Can anyone tell me, thanks.
There is usually no difference. Theses are merely the most common extensions recognized as PHP docs by servers (but you can make config the server to pass almost any extension you choose to the PHP interpreter). Some server's may be running difference versions of the PHP interpreter and use php for PHP4 docs and php3 for PHP3, but this is uncommon. HTH.
Geoff A. Virgo