获取登陆用户的ip
function getip(){
static $ip = null;
if($ip !=null) return $ip;
if(getenv('REMOTE_ADDR')) $ip = sprintf('%u',ip2long(getenv('REMOTE_ADDR')));
elseif(getenv('HTTP_CLIENT_IP')) $ip = sprintf('%u',ip2long(getenv('HTTP_CLIENT_IP')));
elseif(getenv('HTTP_X _FORWARAED_FOR')) $ip = sprintf('%u',ip2long(getenv('HTTP_X _FORWARAED_FOR')));
return $ip;
}
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