Filters sound great... but everything comes with a price.
- • Filtered streams are essentially FIFOs
- • fseek() is not possible
- • PHP 5 only
One of the aims of the filter API is code re-use; bzip2 stream
is really just a file stream with bzip2 (de)compression added on top.
So why not code it that way?
Consider writing a more complex custom stream if you really must be able to fseek().
There is a filter API in 4.3.x, but it is not compatible with
the much better PHP 5 API, so I'm not telling anyone how to use it.