<?php

$a = file_get_contents('data.json');

$b = file_exists("used.json")
    ? file_get_contents("used.json")
    : '[]';


$aArr = json_decode($a, true);
$bArr = json_decode($b, true);


$aArr = array_map(fn($v) => trim(str_replace("\r", "", $v)), $aArr);
$bArr = array_map(fn($v) => trim(str_replace("\r", "", $v)), $bArr);


$available = array_diff($aArr, $bArr);

if (empty($available)) {
    die("Bo‘sh nickname qolmadi");
}


$newNick = $available[array_rand($available)];


$bArr[] = $newNick;


file_put_contents("used.json",json_encode($bArr, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));

echo "Yangi foydalanuvchiga tanlangan nickname: " . $newNick;