Should we check $_SERVER['REMOTE_SERVER'] or what?
Should we check $_SERVER[‘REMOTE_SERVER’] or what?
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This will do the trick:
Be careful you don’t rely on X_FORWARDED_FOR as this header can be easily (and accidentally) spoofed.
The correct way to do this would be to set an environmental variable in your server configuration and then check that. This will also allow you to toggle states between a local environment, staging and production.