Php/docs/mongocollection.setreadpreference
MongoCollection::setReadPreference
(PECL mongo >=1.3.0)
MongoCollection::setReadPreference — Set the read preference for this collection
Description
public MongoCollection::setReadPreference
( string $read_preference
[, array $tags
] ) : bool
Parameters
read_preference
- The read preference mode:
MongoClient::RP_PRIMARY
,MongoClient::RP_PRIMARY_PREFERRED
,MongoClient::RP_SECONDARY
,MongoClient::RP_SECONDARY_PREFERRED
, orMongoClient::RP_NEAREST
. tags
- An array of zero or more tag sets, where each tag set is itself an array of criteria used to match tags on replica set members.
Return Values
Returns TRUE
on success, or FALSE
otherwise.
Errors/Exceptions
Emits E_WARNING
if either parameter is invalid, or if one or more tag sets are provided with the MongoClient::RP_PRIMARY
read preference mode.
Examples
Example #1 MongoCollection::setReadPreference() tag set array syntax example
<?php$m = new MongoClient();$c = $m->test->users;// Prefer the nearest server in the "east" data center also used for reporting,// but fall back to a server in the "west" data center$c->setReadPreference(MongoClient::RP_NEAREST, array( array('dc' => 'east', 'use' => 'reporting'), array('dc' => 'west'),));?>
See Also
- The read preferences documentation.
- MongoCollection::getReadPreference() - Get the read preference for this collection