running scripts on a website

hi
i am currently producing a site which teaches PHP. i was wondering how to run off scripts off the web page i am connected to an apache server. for example:

<? echo “short PHP tags method of escaping from HTML<br>”; ?>
<?php echo “escape using full PHP tags<br>”; ?>
<script language-"php">
echo “Hello are you enjoying PHP”<br>”;
<% echo “You can use the ASP type tags if you wish”<br>”; %>

if i wanted to run this script as an example off the site would it be possible and how could it be done?

regards
iffy