';
  print_r($arg);
  echo '
';
  die();
}

function ffs(): void {
  if (!DEBUG_MODE) return;
  echo '';
  echo '
FOR
 
FUCKS
 
SAKE
';

  $stack = debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 50);
  $st = [];
  unset($stack[0]);
  $i = 0;

  echo '
';
  print_r($stack);
  echo '
';
  foreach ($stack as $s) {
    if (isset($s['file'])) $st[$i]['file'] = $s['file'].(isset($s['line']) ? ':'.$s['line'] : '');
    else $st[$i]['file'] = '';
    if (isset($s['function'])) $st[$i]['func'] = (isset($s['class']) ? $s['class'].(isset($s['type']) ? $s['type'] : '::') : '').$s['function'];
    else $st[$i]['func'] = '';
    if (isset($s['object'])) $st[$i]['objs'] = $s['object'];
    else $st[$i]['objs'] = new \stdClass;
    if (isset($s['args'])) $st[$i]['args'] = $s['args'];
    else $st[$i]['args'] = [];
    $i++;
  }
  unset($stack[$i]);

  foreach ($st as $s) {
    echo '
';
    echo 'ファイル：';
    echo $s['file'].'
';
    echo '関数：';
    echo $s['func'].'
';
    echo 'オブジェクト：';
    echo print_r($s['objs']).'
';
    echo 'その他：';
    echo print_r($s['args']).'
';
    echo '
';
  }
  die();
}

function base58btc_encode(string $bin): string {
  $a = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
  $base = 58;
  $num = \gmp_import($bin, 1, GMP_LSW_FIRST | GMP_NATIVE_ENDIAN);
  $res = '';

  if (\gmp_cmp($num, 0) == 0) return '1';

  while (\gmp_cmp($num, 0) > 0) {
    $mod = \gmp_intval(\gmp_mod($num, $base));
    $res = $a[$mod].$res;
    $num = \gmp_div_q($num, $base);
  }

  $bytes = str_split($bin);
  foreach ($bytes as $byte) {
    if (ord($byte) === 0) {
      $res = '1'.$res;
    } else {
      break;
    }
  }

  return $res;
}

function logger(LogType $section, mixed $arg): void {
  if (!LOGGING_ENABLED) return;
  $success = false;
  $logfile = ROOT.'/log/';

  switch ($section) {
    case LogType::ActivityPub:
      $logfile .= 'ap_log.text';
      $success = true;
      break;
    case LogType::Auth:
      $logfile .= 'auth_log.text';
      $success = true;
      break;
    case LogType::Mailer:
      $logfile .= 'mail_log.text';
      $success = true;
      break;
    default:
      break;
  }

  if ($success) file_put_contents($logfile, $arg."\n", FILE_APPEND);
}

function to_money($amount, $lang) {
  $amount = floatval($amount);

  switch (strtolower($lang)) {
    case 'ja':
      if ($amount >= 100000000) {
        $oku = $amount / 100000000;
        return $oku.'億円';
      } else if ($amount >= 10000) {
        $man = $amount / 10000;
        return $man.'万円';
      }
      return number_format($amount, 0).'円';
    case 'en':
      if ($amount >= 1000000000) {
        $billion = $amount / 1000000000;
        return '¥ '.$billion.' billion';
      } else if ($amount >= 1000000) {
        $million = $amount / 1000000;
        return '¥ '.$million.' million';
      } else if ($amount >= 1000) {
        $thousand = $amount / 1000;
        return '¥ '.$thousand.' thousand';
      }
      return '¥ '.number_format($amount, 0);
    default:
      return '¥ '.number_format($amount, 0);
  }
}

function randstr(): string {
  $len = random_int(1, 20);
  return bin2hex(random_bytes($len));
}

function assert_exists(mixed $assertion, Throwable|string|null $description = null): bool {
  if (ini_get('zend.assertions') < 1) trigger_error('assert機能性が無効です。有効するには、php.iniで「zend.assertions = 1」に設定して下さい。', E_USER_WARNING);
  if (isset($assertion)) return true;
  assert(false, $description ?? 'Assertion failed: value is not null');
  return false;
}

function assert_null(mixed $assertion, Throwable|string|null $description = null): bool {
  if (ini_get('zend.assertions') < 1) trigger_error('assert機能性が無効です。有効するには、php.iniで「zend.assertions = 1」に設定して下さい。', E_USER_WARNING);
  if (is_null($assertion)) return true;
  assert(false, $description ?? 'Assertion failed: value is not null');
  return false;
}

function assert_not_null(mixed $assertion, Throwable|string|null $description = null): bool {
  if (ini_get('zend.assertions') < 1) trigger_error('assert機能性が無効です。有効するには、php.iniで「zend.assertions = 1」に設定して下さい。', E_USER_WARNING);
  if (!is_null($assertion)) return true;
  assert(false, $description ?? 'Assertion failed: value is null');
  return false;
}

function assert_unless_success(Result $assertion, Throwable|string|null $description = null): bool {
  if (ini_get('zend.assertions') < 1) trigger_error('assert機能性が無効です。有効するには、php.iniで「zend.assertions = 1」に設定して下さい。', E_USER_WARNING);
  if ($assertion->isSuccess) return true;
  assert(false, $description ?? $assertion->message ?? 'Assertion failed: Result is not successful');
  return false;
}

function getcookie(string $name): string|null {
  return $_COOKIE[$name] ?? null;
}

function namecolor(\stdClass $userData): string {
  $ban = "#888888";
  $male = "#97ACEF";
  $female = "#F185C9";
  $ungender = "#7C60B0";

  $gender = 'color: '.($userData->gender === Gender::MALE ? $male : ($userData->gender === Gender::FEMALE ? $female : $ungender)).';';
  $style = $userData->namecolor ?: ($userData->role !== Roles::BANNED ? $gender : 'color: '.$ban.';');

  $showname = $userData->displayname ?: $userData->username;

  $color = "{$showname}";
  if ($userData->role & (Roles::ADMIN | Roles::STAFF))
    $color .= "✓";
  $suffix = $userData->gender === Gender::MALE ? 'くん' : ($userData->gender === Gender::FEMALE ? 'ちゃん' : 'さん');

  return $color.$suffix;
}

function make_csrf_token(?bool $force = false): string {
  if (null !== getcookie('csrf_token') && !$force) return getcookie('csrf_token');
  $token = bin2hex(random_bytes(32));
  setcookie('csrf_token', $token, [
    'expires' => time() + 300, // 5分
    'path' => '/',
    'domain' => $_SERVER['SERVER_NAME'],
    'secure' => (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off'),
    'httponly' => true,
    'samesite' => 'Strict'
  ]);
  return $token;
}

function verify_csrf_token(string $token): bool {
  return null !== getcookie('csrf_token') && hash_equals(getcookie('csrf_token'), $token);
}

function count_special_chars(string $str): int {
  $count = 0;
  $len = strlen($str);

  for ($i = 0; $i < $len; ++$i) {
    if (str_contains('!', $str[$i])) ++$count;
    if (str_contains('"', $str[$i])) ++$count;
    if (str_contains('#', $str[$i])) ++$count;
    if (str_contains('$', $str[$i])) ++$count;
    if (str_contains('%', $str[$i])) ++$count;
    if (str_contains('&', $str[$i])) ++$count;
    if (str_contains('\'', $str[$i])) ++$count;
    if (str_contains('(', $str[$i])) ++$count;
    if (str_contains(')', $str[$i])) ++$count;
    if (str_contains('-', $str[$i])) ++$count;
    if (str_contains('=', $str[$i])) ++$count;
    if (str_contains('^', $str[$i])) ++$count;
    if (str_contains('~', $str[$i])) ++$count;
    if (str_contains('\\', $str[$i])) ++$count;
    if (str_contains('|', $str[$i])) ++$count;
    if (str_contains('[', $str[$i])) ++$count;
    if (str_contains(']', $str[$i])) ++$count;
    if (str_contains(':', $str[$i])) ++$count;
    if (str_contains('@', $str[$i])) ++$count;
    if (str_contains('`', $str[$i])) ++$count;
    if (str_contains('*', $str[$i])) ++$count;
    if (str_contains('{', $str[$i])) ++$count;
    if (str_contains('}', $str[$i])) ++$count;
    if (str_contains(';', $str[$i])) ++$count;
    if (str_contains('+', $str[$i])) ++$count;
    if (str_contains(',', $str[$i])) ++$count;
    if (str_contains('<', $str[$i])) ++$count;
    if (str_contains('.', $str[$i])) ++$count;
    if (str_contains('>', $str[$i])) ++$count;
    if (str_contains('/', $str[$i])) ++$count;
    if (str_contains('?', $str[$i])) ++$count;
    if (str_contains('_', $str[$i])) ++$count;
  }

  return $count;
}

function countmatch(string $str): bool {
  $len = strlen($str);

  $numUpper = preg_match_all('/[A-Z]/', $str) ?? 0;
  $numLower = preg_match_all('/[a-z]/', $str) ?? 0;
  $numDigit = preg_match_all('/[0-9]/', $str) ?? 0;
  $numSymbol = count_special_chars($str);
  $sum = $numUpper + $numLower + $numDigit + $numSymbol;

  return $len == $sum;
}

function getImageInfo(string $url): \Std\Lib\Image {
  $img = new \Std\Lib\Image($url);
  return $img;
}

function align(int $val): int {
  if ($val <= 0) return 1;
  if ($val === 1) return 1;

  $res = 0;
  $lower = 1;

  while ($lower * 2 <= $val) $lower *= 2;
  $upper = $lower * 2;

  if (($val - $lower) <= ($upper - $val)) return $lower;
  return $upper;
}

function align_up(int $val): int {
  if ($val <= 0) return 1;
  if ($val === 1) return 1;

  $res = 0;
  $lower = 1;

  while ($lower * 2 <= $val) $lower *= 2;
  $upper = $lower * 2;

  return $upper;
}

function align_down(int $val): int {
  if ($val <= 0) return 1;
  if ($val === 1) return 1;

  $res = 0;
  $lower = 1;

  while ($lower * 2 <= $val) $lower *= 2;
  return $lower;
}

// PHP 8.3と8.4の場合
if (!function_exists('array_last')) {
  function array_last(array $array): mixed {
    return $array === [] ? null : $array[array_key_last($array)];
  }
}