Swoole\Async::readFile (PECL swoole >= 1.9.0)Swoole\Async::readFile — Read a file asynchronously. 说明 public static Swoole\Async::readFile(string $filename, callable $callback): void 参数 filename The filename of the file being read. callback callback(string $filename, string $content): mixed filename The name of the file. content The content readed from the file.