Error with Memcached::set

Question

PHP

I can't find an error in 3 lines of code.

$m = new Memcached();
var_dump($m->addServer('localhost', 11211));
var_dump($m->set("aaaa","bbb"));

we get:

bool(true)
bool(false)

on get and replace is also false.

Is my eye blurred or is the problem still in the Memcached server?

Answer 1

Memcached::addServer() adds the specified server to the server pool. No connection is established to the server at this time
Therefore, it returns true (false is only returned when the parameters are invalid).
See what Memcached::getResultMessage() says after that

Answer 2

through trial and error, it was found that when replacing "localhost" with the ip of the server, the problem disappears