Added `<If "-f %{SCRIPT_FILENAME}">` to load only PHP files that exists. This is to prevent `File not found` error from PHP-FPM and let Apache handle the error output. It removes also unnecessary PHP-FPM calls and `AH01071: Got error ‘Primary script unknown` in PHP error log.
Usually you can find the error whenever someone goes fishing for paths like wp-login.php.
The `<If>` directive is only available in Apache 2.4+ and not 2.2 or earlier.
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