PHP JSON - Check and validate emails

email.php

<?php

function http_json($status, $data = NULL, $httpcode = 200){
    http_response_code($httpcode);
    $out = json_encode(array('status' => $status, 'data' => $data));
    die($out);
}

function fix_hostname($hostname){
    $search = [
        'hotmail.com' => [
            "hitmail.com","hoail.com","homai,com","homail.com",
            "hootmail.com","hormail.com","hot.mail.com","hotamil.com",
            "hotlail.com","hotmai.com","hotmail..com","hotmailm.com",
            "hotmaiul.com","hotmal..com","hotmal.com",
            "hotmil.com","hotnail.com","htomail.com","hit.comail.com",
            "hotail.com","hotamail.com","hotmaik.com","hotmail.co",
            "hotmail.cpm","hotmail.vom","hotmail.vpm","hotmaul.com",
            "hotmeil.com","hotmsil.com","hotmial.com","hoymail.com",
            "hotmail.com.ar","hotmail.com.mx","hotmail.com.pe","hotmail.com.py",
            "hotamail.com.ar","otmail.com","hotsmail.com"
        ],
        'hotmail.es' => ["hotmail.ea","hotmaul.es"],
        'gmail.com' => [
            "gimail.com", "gmai.com", "gmail­com", "gmail..com",
            "gmail.c.com", "gmail.caa", "gmail.com", "gmail.comcom",
            "gmail.con", "gmailcom", "gmali.com", "gmil.com", "g.mail.com",
            "gamail.com", "gemail.com", "gilmail.com", "gmail.cm", "gmail.co",
            "gmail.com.co", "gmail.com.py"
        ],
        'yahoo.com' => ["yagoo.com", "yhoo.com", "yhoo.con","hayoo.com"],
        'outlook.com' => [
            "outk.com","outloock.com","outhlook.com","outkook.com",
            "outlock.com","outlok.com","oulook.com","uotlook.com"
        ],
        'outlook.es' => ["outlook.ds","outtlook.es"],
    ];

    foreach($search as $domain => $values){
        foreach($values as $pos){
            if($hostname == $pos){
                return $domain;
            }
        }
    }

    if(in_array(substr($hostname, -4), ['.con', '.cvm', '.cpm', '.vom', '.von', '.vpm'])){
        return substr($hostname, 0, -4) .".com";
    }

    return FALSE;
}

function blacklist($hostname){
    $list = [
        'a.com', 'aaa.aaa', 'bbb.bbb', 'correo.com', 'ejemplo.com', 'example.com'
    ];

    return in_array($hostname, $list);
}

function check_dns($hostname){
    $hosts = array();
    return getmxrr($hostname, $hosts);
}

// ------------------

header("Content-Type: application/json");

// GET PATH (from Rewrite URL) /script.php/[email protected]
$out = str_replace($_SERVER['SCRIPT_NAME'], "", $_SERVER['PHP_SELF']);
if(strlen($out) > 4 && $out[0] == "/"){ $out = substr($out, 1); }

if(isset($_REQUEST['email'])){
    $email = $_REQUEST['email'];
}elseif(strlen($out) > 4){
    $email = $out;
}

if(empty($email)){
    http_json("ERROR", "EMPTY", 400);
}

if(filter_var($email, FILTER_VALIDATE_EMAIL) === FALSE){
    $tmp = base64_decode($email); // Intentar decodificar BASE64
    if(filter_var($tmp, FILTER_VALIDATE_EMAIL) === FALSE){
        http_json("ERROR", "NOT_VALID", 404);
    }
    $email = $tmp;
    unset($tmp);
}

$email = strtolower($email); // HACK
$h = substr($email, strpos($email, "@") + 1);

if(blacklist($h)){
    http_json("ERROR", "BLACKLIST", 401);
}

$check = fix_hostname($h);
if($check !== FALSE){
    $email = str_replace($h, $check, $email);
    http_json("SUGGEST", $email, 300);
}

if(check_dns($h) === FALSE){
    http_json("ERROR", "DNS_ERROR", 404);
}