PHP Manual: streamWrapper::stream_set

public function streamWrapper::stream_set_option(int $option, int $arg1, int $arg2): bool

This method is called to set options on the stream.

option

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_READ_BUFFER (The method was called in response to stream_set_read_buffer())
STREAM_OPTION_WRITE_BUFFER (The method was called in response to stream_set_write_buffer())

arg1

If option is

STREAM_OPTION_BLOCKING: requested blocking mode (1 meaning block 0 not blocking).
STREAM_OPTION_READ_TIMEOUT: the timeout in seconds.
STREAM_OPTION_READ_BUFFER: buffer mode (STREAM_BUFFER_NONE or STREAM_BUFFER_FULL).
STREAM_OPTION_WRITE_BUFFER: buffer mode (STREAM_BUFFER_NONE or STREAM_BUFFER_FULL).

arg2

If option is

Returns true on success or false on failure. If option is not implemented, false should be returned.

streamWrapper::stream_set_option