#http\Message\Body http\Message\Body::toCallback(callable $callback[, int $offset = 0[, int $maxlen = 0]])

Stream the message body through a callback.

Params:#

• callable $callback#
  The callback of the form function(http\Message\Body $from#, string $data#).
• Optional int $offset# = 0
  Start to stream from this offset.
• Optional int $maxlen# = 0
  Stream at most $maxlen bytes, or all if $maxlen is less than 1.

Returns:#

• http\Message\Body, self.