MongoDB\Driver\ReadPreference::getTagSets

Returns the ReadPreference's "tagSets" option

&reftitle.description; final public `array` `MongoDB\Driver\ReadPreference::getTagSets`
&reftitle.parameters; &no.function.parameters;
&reftitle.returnvalues;

Returns the ReadPreference's "tagSets" option.

&reftitle.errors;

&mongodb.throws.argumentparsing;

&reftitle.examples;

### `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());

    ?>

&example.outputs;

    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) {
      }
    }

&reftitle.seealso;

- Read Preference reference