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I’m working on a system that relies in $_SERVER[‘REMOTE_ADDR’] to get the user address and check it against a white list of addresses.
Is this approach safe? Or is there a way of forcing values in superglobal variables?
Thank you,
Diogo
The value itself should be safe from outside injection – it is served by the web server – , but the client IP can be spoofed.
Related good reading: What is the most accurate way to retrieve a user’s correct IP address in PHP?