What is phtml, and when should I use a .phtml extension rather than .php?

Question

I\'m wondering what the difference between .phtml and .php files is, and when to use one over the other.

Answer 1

.phtml was the standard file extension for PHP 2 programs. .php3 took over for PHP 3. When PHP 4 came out they switched to a straight .php.

The older file extensions are still sometimes used, but aren't so common.