(PECL mongo >=1.3.0)
Set the read preference for this database
public bool MongoDB::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 TRUE
on success, or FALSE
otherwise.
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.
Examples:
MongoDB::setReadPreference() tag set array syntax example
<?php $m = new MongoClient(); $db = $m->test; // Prefer the nearest server in the "east" data center also used for reporting, // but fall back to a server in the "west" data center $db->setReadPreference(MongoClient::RP_NEAREST, array( array('dc' => 'east', 'use' => 'reporting'), array('dc' => 'west'), )); ?>
See also:
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