(mongodb >=1.0.0)
MongoDB\Driver\Manager::selectServer — Select a server matching a read preference
$readPreference
   )
   Selects a MongoDB\Driver\Server matching
   readPreference. This may be used to preselect a server
   in order to perform version checking before executing an operation.
  
readPreference (MongoDB\Driver\ReadPreference)Optionally, a MongoDB\Driver\ReadPreference to select the server for this operation. If none is given, the read preference from the MongoDB Connection URI will be used.
Returns an MongoDB\Driver\Server matching the read preference.