<? $welcome_text = "Hello and welcome to my website."; print($welcome_text); ?>
AND
<? $welcome_text = "Hello and welcome to my website."; echo ($welcome_text); ?>
Have a look at:
http://www.phpbuilder.com/board/showthread.php?s=&threadid=10246071&highlight=echo+print
Covers it in many different ways...
This article will also help shed some light on the differences.