Submitted by Adam » We're going to be constructing an Apache-like, in fact we're going to be emulating the Apache ACL in its entirety. Although you could quite easily use Apache, this allows you to see how it's all done and even extend onto it to allow temporary bans which expire after a certain amount of time - if you were that way inclined.
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very detailed walk through and great references to places where you are more abrupt and less detailed. Not a pro with php, but after this tut, I could code this with confidence. Well done!