How to get the client IP address in PHP [duplicate]

Answer 1

This function is compact and you can use it everywhere. But!

Don't forget this! In this type of functions or code blocks there is not a guarantee for recording the user's real IP address because some users can use a proxy or another secure gateway for be invisible or cannot tracking

PHP function:

function GetIP()
{
    if ( getenv("HTTP_CLIENT_IP") ) {
        $ip = getenv("HTTP_CLIENT_IP");
    } elseif ( getenv("HTTP_X_FORWARDED_FOR") ) {
        $ip = getenv("HTTP_X_FORWARDED_FOR");
        if ( strstr($ip, ',') ) {
            $tmp = explode(',', $ip);
            $ip = trim($tmp[0]);
        }
    } else {
        $ip = getenv("REMOTE_ADDR");
    }
    return $ip;
}

Usage:

$IP = GetIP(); or directly GetIP();