(PECL mongo >=1.1.0)
Mongo::getSlave — Returns the address being used by this for slaveOkay reads
This finds the address of the secondary currently being used for reads. It is a read-only method: it does not change anything about the internal state of the object.
When you create a connection to the database, the driver will not immediately decide on a secondary to use. Thus, after you connect, this function will return
NULL even if there are secondaries available. When you first do a query with slaveOkay set, at that point the driver will choose a secondary for this connection. At that point, this function will return the chosen secondary.
See the query section of this manual for information on distributing reads to secondaries.
У этой функции нет параметров.
The address of the secondary this connection is using for reads.
NULL if this is not connected to a replica set or not yet initialized.
Вызывает ошибку уровня
The returned results aren't really useful as the secondary selection process is done on each query and database command execution.