Fallagassrini Bypass Shell

<?php

function cache_file(string $key, array $config): string {
  $dir = $config['cache']['dir'] ?? sys_get_temp_dir();
  return rtrim($dir, '/\\') . '/' . sha1($key) . '.json';
}

function cache_get(string $key, array $config) {
  $file = cache_file($key, $config);
  if (!file_exists($file)) return null;

  $raw = @file_get_contents($file);
  $j = json_decode($raw ?: '', true);
  if (!is_array($j)) return null;

  $exp = (int)($j['expires'] ?? 0);
  if ($exp > 0 && time() > $exp) {
    @unlink($file);
    return null;
  }
  return $j['data'] ?? null;
}

function cache_set(string $key, $data, int $ttlSeconds, array $config): void {
  $file = cache_file($key, $config);
  $payload = [
    'expires' => time() + max(1, $ttlSeconds),
    'data'    => $data
  ];
  @file_put_contents($file, json_encode($payload, JSON_UNESCAPED_UNICODE));
}