You can use the schema manager to perform CRUD actions on databases within ArangoDB.
Get information on the current database
$arangoClient->schema()->getCurrentDatabase();
Get a list of databases accessible to the current user.
$arangoClient->schema()->getDatabases();
Check if a database exists
$arangoClient->schema()->hasDatabase('someNoneExistingDatabase');
Create a database.
See ArangoDB's documentation for the current available options
$arangoClient->schema()->createDatabase('someNoneExistingDatabase');
Delete the given database.
$arangoClient->schema()->deleteDatabase('someExistingDatabase');