Add SO_LINGER option for streams

[sezeryalcin]

stream_context_set_option() function currently does not list/support socket layer SO_LINGER option. Adding this, and probably any other socket options to streams will improve stream functionality.

$conn = @stream_socket_accept(9999, 0)
$stream_opts = [
'socket' => ['so_linger' => 0 ]
];
stream_context_set_option($conn, $stream_opts);