(PHP 5 >= 5.2.0, PHP 7, PECL swoole >= 1.9.0)
swoole_select — Select the file descriptions which are ready to read/write or error in the eventloop
&$read_array
, array &$write_array
, array &$error_array
[, float $timeout
] ) : int
read_array
write_array
error_array
timeout