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I will explain some of the main parts that.
create the zelez IP lookup tool.

Getting the users IP.
We will call the function UserIP.

Get IP in PHP
  function UserIP(){
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
    $ip = $_SERVER['REMOTE_ADDR'];
    } return $ip; }

Now we have to make a $var from this function.

Get IP output PHP
  $UserPublicIP = UserIP();

We could now say the users public IP.

Say user IP
  echo $UserPublicIP;