whats the best format? (php/php4/html)

[snyx]

whats the advantage of using different file extentions?

is php4 faster for its own reason?
is html slower?

[Floris]

.html is a static page
.php is a dynamic page.
.php3 is basicly for systems that installed php3
.php4 is basicly for systems that installed php4
but .. I always prefer to use just .php since both php3 and php4 in the most situations allow .php
If I don't need end-user input and database output, I use .html