--TEST-- MongoDB\Driver\Manager::__construct() with duplicate read preference tags --FILE-- <?php $manager = new MongoDB\Driver\Manager(null, ['readPreference' => 'secondary', 'readPreferenceTags' => [['dc' => 'ny']], 'readpreferencetags' => [['dc' => 'ca']]]); var_dump($manager->getReadPreference()->getTagSets()); ?> ===DONE=== <?php exit(0); ?> --EXPECT-- array(1) { [0]=> array(1) { ["dc"]=> string(2) "ca" } } ===DONE===