Why you should not rely entirely on an IP
Filtering users by their IP address may seem like a good idea when you're beginning PHP, even coders that should know better have been caught giving too much trust to an IP. I remember the first PHP project I did, entitled rMetal - which was a website dedicated to various bands from the metal genre in my younger days, I didn't know about sessions and I didn't care to read up, either. As a consequence my system's login was constructed by if your IP address is the same as the one in the database, you're OK. Boy, was I in for a shock!
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| by Sean
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