class FilesystemCache

class FilesystemCache implements CacheInterface, RemovableCacheInterface {
    public const FORCE_BYTECODE_INVALIDATION = 1;
    private $directory;
    private $options;
    public function __construct(string $directory, int $options = 0) {
        $this->directory = rtrim($directory, '\\/') . '/';
        $this->options = $options;
    }
    public function generateKey(string $name, string $className) : string {
        $hash = hash(\PHP_VERSION_ID < 80100 ? 'sha256' : 'xxh128', $className);
        return $this->directory . $hash[0] . $hash[1] . '/' . $hash . '.php';
    }
    public function load(string $key) : void {
        if (is_file($key)) {
            @(include_once $key);
        }
    }
    public function write(string $key, string $content) : void {
        $dir = \dirname($key);
        if (!is_dir($dir)) {
            if (false === @mkdir($dir, 0777, true)) {
                clearstatcache(true, $dir);
                if (!is_dir($dir)) {
                    throw new \RuntimeException(\sprintf('Unable to create the cache directory (%s).', $dir));
                }
            }
        }
        elseif (!is_writable($dir)) {
            throw new \RuntimeException(\sprintf('Unable to write in the cache directory (%s).', $dir));
        }
        $tmpFile = tempnam($dir, basename($key));
        if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $key)) {
            @chmod($key, 0666 & ~umask());
            if (self::FORCE_BYTECODE_INVALIDATION == ($this->options & self::FORCE_BYTECODE_INVALIDATION)) {
                // Compile cached file into bytecode cache
                if (\function_exists('opcache_invalidate') && filter_var(\ini_get('opcache.enable'), \FILTER_VALIDATE_BOOLEAN)) {
                    @opcache_invalidate($key, true);
                }
                elseif (\function_exists('apc_compile_file')) {
                    apc_compile_file($key);
                }
            }
            return;
        }
        throw new \RuntimeException(\sprintf('Failed to write cache file "%s".', $key));
    }
    public function remove(string $name, string $cls) : void {
        $key = $this->generateKey($name, $cls);
        if (!@unlink($key) && file_exists($key)) {
            throw new \RuntimeException(\sprintf('Failed to delete cache file "%s".', $key));
        }
    }
    public function getTimestamp(string $key) : int {
        if (!is_file($key)) {
            return 0;
        }
        return (int) @filemtime($key);
    }

}