How to ban someone from accessing my website in PHP [Not IP ban] -

i've been looking on place find more ways ban users accessing website. i'm using php & iis. have heard of mac banning someone? unaware how works, want add additional security bans; if superban site, drop cookie, ban ip , possibly ban computer.

i know there's ways of them, of people use website not computer-savvy; won't know how bypass it. preferably looking done in php, since site made of php.

if don't want ip bans, , said above mac address bans not possible on internet, reliable method have user registration system. when they're banned, don't let them log in , use site. ip irrelevant. there ways around too, though. have site set cookie when banned user tries login prevents new registration attempts - if users not tech-savvy, may sufficient put them off.