php - How to list all databases using yii2 in mongodb? -

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i need list of databases on current server. using yii2 framework. how list of databases? yii2 v2.1 has functions list of databases, want use yii2 v2.0.

$all = yii::$app->mongodb->createcommand()->listdatabases();

where mongodb configured mongo instance. response may like:

$all:array =    0: array =      name: string = local     sizeondisk: double = 83886080     empty: bool = false   1: array =      name: string = testdd     sizeondisk: double = 19268632576     empty: bool = false   2: array =      name: string = admin     sizeondisk: double = 1     empty: bool = true

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