This method is called to set options on the stream.
$option can be one of:
STREAM_OPTION_BLOCKING (The method was called in response to stream_set_blocking())
STREAM_OPTION_READ_TIMEOUT (The method was called in response to stream_set_timeout())
STREAM_OPTION_WRITE_BUFFER (The method was called in response to stream_set_write_buffer())
If $option is ... then $arg1 is set to:
STREAM_OPTION_BLOCKING: requested blocking mode (1 meaning block 0 not blocking).
STREAM_OPTION_READ_TIMEOUT: the timeout in seconds.
STREAM_OPTION_WRITE_BUFFER: buffer mode (STREAM_BUFFER_NONE or STREAM_BUFFER_FULL).
If $option is ... then $arg2 is set to:
STREAM_OPTION_BLOCKING: This option is not set.
STREAM_OPTION_READ_TIMEOUT: the timeout in microseconds.
STREAM_OPTION_WRITE_BUFFER: the requested buffer size.
