(PECL mongo >=1.6.0)
Set the read preference for this query
abstract public MongoCursorInterface MongoCursorInterface::setReadPreference ( string $read_preference [, array $tags ] )
Parameters:
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.
Returns:
Returns this cursor.
Exception:
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.
See also:
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