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.

错误／异常

示例

示例 #1 MongoDB\Driver\ReadPreference::getTagSets() example

<?php

$mode = MongoDB\Driver\ReadPreference::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());

?>

以上示例会输出：

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) {
  }
}