21 use GuzzleHttp\Psr7\StreamDecoratorTrait;
22 use GuzzleHttp\Psr7\Utils;
23 use Psr\Http\Message\StreamInterface;
37 use StreamDecoratorTrait;
45 $this->stream = Utils::streamFor();
46 $this->callback = $cb;
49 public function write( $string ) {
50 return call_user_func( $this->callback, $this, $string );
__construct(callable $cb)