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When viewing this program in a browser, I'm getting nothing - no html, no php, no source whatsoever - just white. The page is coming up blank. Any idea why?
Blank pages typically mean syntax errors and hidden error messages. Open up your php.ini and set error_reporting=E_ALL and set display_errors=on - that will let you see PHP's parse errors.
Since your script is so small you can just look at it for a syntax error. See how the highlighting is unusual towards the end? That's a hint as to where the problem is.