To NogDog:
Tried your script: same result.
To bradgrafelman:
Thanks. I set display_errors to ON, error_reporting was already set to E_ALL. I checked Apache's error logs (no clues) then restarted Apache (and, presumably, PHP), and ran NogDog's script. No change in Apache error logs, still no output in Firefox.
Yes, of course, here are the changes:
#BEGIN PHP INSTALLER EDITS - REMOVE ONLY ON UNINSTALL
PHPIniDir "C:\Program Files\Server\PHP\"
LoadModule php5_module "C:\Program Files\Server\PHP\php5apache2_2.dll"
#END PHP INSTALLER EDITS - REMOVE ONLY ON UNINSTALL
and:
AddType application/x-httpd-php .php .html
Thanks to you both