Thanks for your response. I checked the Apache httpd.conf file and had the following PHP-related AddTypes (I haven't modified the file):
AddType application/x-httpd-php .php
AddType application/x-httpd-php .php3
I am also in the habit of changing my windows to show file extensions, but I double-checked that, as well, just to be sure, and my file does truly have a PHP extension.
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