<?php
// The blacklisted ips.
$denied_ips = array(
            '93.213.49.204'

        );
 
// The function to get the visitor's IP.
function getUserIP()
{
    //check ip from share internet
    if (!empty($_SERVER['HTTP_CLIENT_IP']))
    {
      $ip=$_SERVER['HTTP_CLIENT_IP'];
    }
    //to check ip is pass from proxy
    elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
    {
      $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
    }
    else
    {
      $ip=$_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}
 
//The user
$visitorIp = getUserIP();
 
// Now let's search if this IP is blackliated
$status = array_search($visitorIp, $denied_ips);
 
// Let's check if $status has a true OR false value.
if($status !== false)
    {
    echo "Error not found";
    // header("Location: http://zombo.com");
    exit;
    }
?>

Read more: http://vidiame.com/php/how-to-block-multiple-ip-addresses-using-php#ixzz2AuYnCvTX