Fix: Disable warnings to prevent file_get_contents showing file warnings.
Add: Stop the script if the server fingerprint is a mis-match.
Fix: Better script argument usage.
Fix: Correct fingerprint argument checking to use new function/
Add: Output debug to confirm fingerprint match.
Fix: Stricter type checking to prevent empty string passing as NULL.
Add: Line of debug to show checksum file load operation.
Optimization: Destroy $server_fingerprint variable when we're done with it.
Change: Remove newline that's output before file check output.