<?php
    $list = array(
                   "123.*.*.*",
                   "124.51.12.*"
                 );

    function checkBlockList() {
        global $list;

        foreach($list as $ip) {
            $ip = split($ip, ".");
            $rmip = split($_SERVER['REMOTE_ADDR'], ".");
            $count = 0;

            if(count($ip) != 4)
                die("Invald IP in \$list array. Check \"{$_SERVER['PHP_SELF']}\" file.");

            if(count($rmip) != 4)
                die("Invalid remote IP address??!?!");

            for($i=0;$i<4;$i++)
                if(trim($ip[$i]) != "*" && trim($ip[$i]) != trim($rmip[$i]))
                    break;

            if($i == 4)
                die("Your IP is invalid. You're blocked, must suck.");
        }
    }
?>

<?php
    include("block.php");
    checkBlockList();
    echo "You aren't on the block list, welcome!";
?>