Minecraft whitelist adder

addWhitelist.php

<?php
function curl($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
    $r = curl_exec($ch);
    curl_close($ch);
    return $r;
}

try{

@$username = $argv[1];

if (empty($username)) {
    throw new Exception('NO USERNAME!');
}

$url = "https://api.mojang.com/users/profiles/minecraft/" . urlencode($username);
$content = curl($url);
$uuid = json_decode($content, true) ["id"];

if (!empty($uuid)) {
    $uuid = substr($uuid, 0, 8) . '-' . substr($uuid, 8, 4) . '-' . substr($uuid, 12, 4) . '-' . substr($uuid, 16, 4) . '-' . substr($uuid, 20, 12);
    echo "Found \033[4m\033[41mOnline\033[0m UUID: \033[42m$uuid\033[0m" . PHP_EOL;
} else {
    $uuid = md5("OfflinePlayer:$username");
    $uuid = substr($uuid, 0, 8) . '-' . substr($uuid, 8, 4) . '-' . substr($uuid, 12, 4) . '-' . substr($uuid, 16, 4) . '-' . substr($uuid, 20, 12);
    echo "Found \033[4m\033[45mOffline\033[0m UUID: \033[42m$uuid\033[0m" . PHP_EOL;
}

echo "\033[94mAre you sure you want to add UUID which belongs to \033[7m$username\033[27m to the whitelist? Type 'y' to continue: \033[0m";
$handle = fopen("php://stdin", "r");
$line = fgets($handle);

if (trim($line) != 'y') {
    die("\033[4mABORTING!\033[0m" . PHP_EOL);
}

fclose($handle);
echo "\033[93mCommand Accepted. Processing...\033[0m" . PHP_EOL;
    $whitelist = json_decode(file_get_contents("./whitelist.json"), true);
    foreach ($whitelist as & $value) {
        if ($value["name"] == $username || $value["uuid"] == $uuid) {
            throw new Exception("Found duplicate users: " . json_encode($value, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
        }
    }

    array_push($whitelist, array(
        "uuid" => $uuid,
        "name" => $username
    ));
    if(!file_put_contents("./whitelist.json", json_encode($whitelist, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT), LOCK_EX)) throw new Exception("Write file failed!");
    require('Rcon.php');
    $rcon = new Rcon("localhost", 25575, 'Rcon Passwd', 3);
    if ($rcon->connect()){
        $rcon->sendCommand("whitelist reload");
    } else {
        throw new Exception("Rcon connect failed!");
    }
} catch (Exception $e) {
    echo("\033[1;31mCaught exception: " . $e->getMessage() . "\033[0m" . PHP_EOL);
    die();
}

echo("\033[1;4;32mSuccessfully!\033[0m" . PHP_EOL);
exit();