# MongoDB\Driver\TopologyDescription::hasReadableServer

(mongodb >=1.13.0)

MongoDB\Driver\TopologyDescription::hasReadableServer — Returns whether the topology has a readable server

### Descripción

final public MongoDB\Driver\TopologyDescription::hasReadableServer(?MongoDB\Driver\ReadPreference `$readPreference` = `null`): bool

Returns whether the topology has a readable server or, if `readPreference` is specified, a server matching the specified read preference.

### Parámetros

Esta función no tiene parámetros.

### Valores devueltos

Returns whether the topology has a readable server or, if `readPreference` is specified, a server matching the specified read preference.

### Errores/Excepciones

- Lanza una MongoDB\Driver\Exception\InvalidArgumentException en errores de análisis de argumentos.