Description:
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From manual page: https://php.net/memcached.getstats always returns an array

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If no server is available, Memcached::getStats() will return false instead of returning an array as documented. The code behavior is actually more logical, and consistent with the behavior of the Memcache extension in that case, so it really is a documentation issue, not a code issue.

Test script:
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$mc = new \Memcached('bin');
$mc->addServer('127.0.0.1', '11239'); // Assuming an unavailable instance.
$stats = $mc->getStats();
echo ($stats === false) ? "KO" : "OK";


Expected result:
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OK

Actual result:
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KO