Description:
------------
I am not good at english . 

I pass an array with 257 sockets to monitor for changes, a warning :
unable to select [0]:An operation was attempted on something that is not a socket.

Why?

Reproduce code:
---------------
$i = 0;
$sockets = array();
while (true) {
	$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
	if (socket_connect($socket, '192.168.1.101', 11001)) {
		socket_set_nonblock($socket);
		$sockets[] = $socket;
		$i = $i + 1;
	} else {
		break;
	}
}
echo $i;

Expected result:
----------------
$i=257 always.

How can pass an array more than 257 sockets ?