- PHP Manual
- MongoDB\Driver\ReadPreference
- Returns the ReadPreference's "tagSets" option
MongoDB\Driver\ReadPreference::getTagSets
(mongodb >=1.0.0)
MongoDB\Driver\ReadPreference::getTagSets — Returns the ReadPreference's "tagSets" option
说明
final public MongoDB\Driver\ReadPreference::getTagSets ( ) : array
参数
此函数没有参数。
返回值
Returns the ReadPreference's "tagSets" option.
范例
Example #1 MongoDB\Driver\ReadPreference::getTagSets() example
<?php$mode = MongoDB\Driver\ReadPreference::RP_SECONDARY_PREFERRED;/* Null and an empty array both denote no tag set preference. */$rp = new MongoDB\Driver\ReadPreference($mode, null);var_dump($rp->getTagSets());$rp = new MongoDB\Driver\ReadPreference($mode, []);var_dump($rp->getTagSets());/* Prefer a node in New York, but fall back to any available node. */$rp = new MongoDB\Driver\ReadPreference($mode, [[../'dc' => 'ny']]);var_dump($rp->getTagSets());/* Prefer a node in the New York, followed by a node in San Francisco that is labeled for reporting usage, and finally fall back to any available node. */$rp = new MongoDB\Driver\ReadPreference($mode, [ ['dc' => 'ny'], ['dc' => 'sf', 'use' => 'reporting'], [],]);var_dump($rp->getTagSets());?>
以上例程会输出:
array(0) { } array(0) { } array(2) { [0]=> array(1) { ["dc"]=> string(2) "ny" } [1]=> array(0) { } } array(3) { [0]=> array(1) { ["dc"]=> string(2) "ny" } [1]=> array(2) { ["dc"]=> string(2) "sf" ["use"]=> string(9) "reporting" } [2]=> array(0) { } }