21 use GuzzleHttp\Psr7\StreamDecoratorTrait;
22 use GuzzleHttp\Psr7\Utils;
23 use Psr\Http\Message\StreamInterface;
37 use StreamDecoratorTrait;
42 $this->stream = Utils::streamFor();
43 $this->callback = $cb;
46 public function write( $string ) {
47 return call_user_func( $this->callback, $this, $string );
__construct(callable $cb)