PHP Apache not loaded as Apache module

I’m having to use PHP on a Linux server that
does not have PHP added as an Apache module.

When embedding PHP into my html, where do I
specify the path to the php software (/usr/bin/php), do I place it as the first line in my html file, on the SCRIPT NAme line
or elsewhere. An example would be ideal.

I have no problem when using a php file that
is just php, in which case I just insert the
path to php as the first line of the script.