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# MongoCursor::setReadPreference

(PECL mongo >=1.3.0)

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

### Opis

public bool MongoCursor::setReadPreference ( int `$read_preference` [, array `$tags` ] )

### Parametry

`read_preference`

  The read preference mode: `Mongo::RP_PRIMARY`, `Mongo::RP_PRIMARY_PREFERRED`, `Mongo::RP_SECONDARY`, `Mongo::RP_SECONDARY_PREFERRED`, or `Mongo::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.

### Zwracane wartości

Returns `TRUE` on success, or `FALSE` otherwise.

### Przykłady

Przykład #1 MongoCursor::setReadPreference() tag set array syntaxexample

`<?php
$m = new MongoClient();
$cursor = $m->test->users->find();
// Prefer the nearest server in the "east" data center also used for reporting,
// but fall back to a server in the "west" data center
$cursor->setReadPreference(MongoClient::RP_NEAREST, array(
array('dc' => 'east', 'use' => 'reporting'),
array('dc' => 'west'),
));`

### Zobacz też:

- The read preferences documentation.

MongoCursor::setFlag
MongoCursor::skip
MongoCursor
PHP Manual