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IP blocker
What is happening when a user is banned?
Is his ip blocked or can the user sign-up with on other ip?
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I wouldn't ban such users immediately, but certainly I'd keep an eye on them to see if they exhibited the same problems that caused me to ban the other.
You're never going to catch all of the dupers, but most make stupid mistakes sooner or later.
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) $ip = $_SERVER['HTTP_X_FORWARDED_FOR']; else $ip = $_SERVER['REMOTE_ADDR'];
*note: it's on one line but that breaks the forum layout..
Although 'HTTP_X_FORWARDED_FOR' can be spoofed easily...