Register filters as resources when
instantiated by stream_filter_(ap|pre)pend().
Export php_stream_filter_flush() internal function to wind buffered data
out of a particular filter until consumed by a later filter or sent to
stream->readbuffer or stream->ops->write()
Disables a wrapper (user-defined or built-in) for the life of the request.
Add stream_wrapper_restore()
Restores the wrapper originally defined at the time the request started
to the protocol name mentioned.
You may then set options that affect streams operations for the whole script.
Added stream_socket_enable_crypto() which allows you to turn on or off a crypto
layer (eg: SSL/TLS) on stream, if supported by the underlying transport.
Registered a bunch of constants for that.
