Auto Generate Spotify

<?php
error_reporting(0);
$headers = array();
$headers[] = 'User-Agent: Spotify/8.4.98 Android/25 (ASUS_X00HD)';
$headers[] = 'Content-Type: application/x-www-form-urlencoded';
$headers[] = 'Connection: Keep-Alive';

// CURL Register Spotify
echo "===========================\n";
echo "Auto Create Spotify Account\n";
echo "      By : Vio\n";
echo "===========================\n";
while (1)
{
    for ($i=0; $i <= 999 ; $i++) {
        $mail = "gdhn".$i."@getnada.com";
        $send = curl('https://spclient.wg.spotify.com:443/signup/public/v1/account/', 'iagree=true&birth_day=12&platform=Android-ARM&creation_point=client_mobile&password=sgb123&key=142b583129b2df829de3656f9eb484e6&birth_year=2000&email='.$mail.'&gender=male&app_version=849800892&birth_month=12&password_repeat=sgb123', $headers);
        $data = json_decode($send[0]);
        if ($data->status == 1) {
            echo "\nSukses | Email : ".$mail;
            $file = "spotify.html";
            $handle = fopen($file, 'a');
            fwrite($handle, $mail."<br>");
            fclose($handle);
        } else {
            echo $data->errors->email."\n";
        }
    }
}

function random($length,$a)
{
        $str = "";
        if ($a == 0) {
            $characters = array_merge(range('0','9'));
        }elseif ($a == 1) {
            $characters = array_merge(range('a','z'));
        }elseif ($a == 2) {
            $characters = array_merge(range('A','Z'));
        }elseif ($a == 3) {
            $characters = array_merge(range('0','9'),range('a','z'));
        }elseif ($a == 4) {
            $characters = array_merge(range('0','9'),range('A','Z'));
        }elseif ($a == 5) {
            $characters = array_merge(range('a','z'),range('A','Z'));
        }elseif ($a == 6) {
            $characters = array_merge(range('0','9'),range('a','z'),range('A','Z'));
        }
        $max = count($characters) - 1;
        for ($i = 0; $i < $length; $i++) {
            $rand = mt_rand(0, $max);
            $str .= $characters[$rand];
        }
        return $str;
}

function curl($url, $fields = null, $headers = null)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        if ($fields !== null) {
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
        }
        if ($headers !== null) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        }
        $result   = curl_exec($ch);
        $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        return array(
            $result,
            $httpcode
        );
 }