(PECL eio >= 0.0.1dev)
Transfer data between file descriptors
resource eio_sendfile ( mixed $out_fd, mixed $in_fd, int $offset, int $length [, int $pri [, callable $callback [, string $data ]]] )
eio_sendfile() copies data between one file descriptor and another. See SENDFILE(2) man page for details.
Parameters:
out_fd
Output stream, Socket resource, or file descriptor