What would cause a machine not to read/process php?

I have a laptop that I have been ever increasing using for php scripting. I decided to do a simple experiment, it started out something like:

$seconds=1;
$minutes=$seconds*60;
$hours=$minutes*60;
$days="$hours*24;

echo $seconds;
echo $minutes;
echo $hours;
echo $days;

Nothing showed in the browser on my local server. I then tried various changes, adding single quotes, double quotes, parenthsis, changing echo to print....nothing.

Finally, after looking online and through a couples of books, I was able to get this in the browser:

$minutes"; echo $hours; echo $days; ?>

I also got this in a browser (code not included in this post but you can see how far back to the basics I went to get this to work).

Hello World'; echo "

$minutes
"; echo $hours; echo $days; ?>

When I sent the file over to my other computer...I got what I thought I was going to get, numbers and calculations.

What would cause a browser to display the closing tags of php?

I dont know where to begin to look, could this be a setting in my editor (Dreamweaver CS3), the testing server config file, the browsers?

Thanks for your help.

Gary

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