Usually callbacks are user functions that can be called by api for errors, async IO and similar. Better definition here.
There's a codesnip here that uses them in this fashion.
Maybe more info here too.
Вопрос
http://www.php.net/manual/en/wrappers.ssh2.php
One of the context options is callbacks but it doesn't have a description next to it. In fact it's the only context option that doesn't have a description next to it.
Any ideas?