$persistentId public property
An ID that identifies a Memcached instance. This property is used only when $useMemcached is true. By default the Memcached instances are destroyed at the end of the request. To create an instance that persists between requests, you may specify a unique ID for the instance. All instances created with the same ID will share the same connection.
See also http://ca2.php.net/manual/en/memcached.construct.php.
public string $persistentId = null
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