MongoCursorInterface::setReadPreference

(PECL mongo >=1.6.0)

MongoCursorInterface::setReadPreference — Set the read preference for this query

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abstract public MongoCursorInterface::setReadPreference ( string $read_preference [, array $tags ] ) : MongoCursorInterface

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read_preference

The read preference mode: MongoClient::RP_PRIMARY, MongoClient::RP_PRIMARY_PREFERRED, MongoClient::RP_SECONDARY, MongoClient::RP_SECONDARY_PREFERRED, or MongoClient::RP_NEAREST.

tags

An array of zero or more tag sets, where each tag set is itself an array of criteria used to match tags on replica set members.

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Returns this cursor.

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Emits E_WARNING if either parameter is invalid, or if one or more tag sets are provided with the MongoClient::RP_PRIMARY read preference mode.

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