<?php  

function IP_adresi_alma()
{
if (!empty($_SERVER['HTTP_CLIENT_İP']))
{
$IP = $_SERVER['HTTP_CLIENT_İP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
$IP = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
else{
$IP = $_SERVER['REMOTE_ADDR'];
}
return $IP;
}

echo IP_adresi_alma();