Stream::seek( $offset, $whence = SEEK_SET )

143    public function seek($offset, $whence = \SEEK_SET): void144    {145        if (!isset($this->stream)) {146            throw new \RuntimeException('Stream is detached');147        }148        if (!$this->seekable) {149            throw new \RuntimeException('Stream is not seekable');150        }151        if (-1 === \fseek($this->stream, $offset, $whence)) {152            throw new \RuntimeException('Unable to seek to stream position "' . $offset . '" with whence ' . \var_export($whence, \true));153        }154    }