Socket::read() can get stuck reading 0 bytes in a loop

[arnaud-lb]

I've seen multiple PHP processes getting stuck in a loop here when the cassandra node goes down.

Apparently, socket_read() returns an empty string when the other side has closed the connection.

[arnaud-lb]

socket_read() uses recv(), which is documented to return 0 if the peer has performed an orderly shutdown.

When recv() returns 0, PHP returns an empty string.

[gonzaloserrano]

I think this fix fixes somewhat #36 due to avoiding the infinite loop reported.

[shen2]

It seems your Cassandra version is 2.0.x.
php-cassandra supports Cassandra 2.1 or later.

[locked]

We have this issue too, for example if we restart a cassandra node while php was connected. We use cassandra 2.1.