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https://wodewangzhishime.blogspot.com/2021/08/airforce-cant-convoy.html . Ref: https://wodewangzhishime.blogspot.com/2021/07/httpswodewangzhishime_76.html?m=1 . Me: What does function session (ip, user_name,password) mean ?? John: It mean, . if (ip != "") { if (user_name !="") { if (password !="") { build up a session or cookie (); } } } . John: Hackers change the function session ("ip", "user_name", "password") into function session ("ip"); . That mean, . if (ip != null) { build up a session or cookie (); }