I am having a multidimensional array like this:

```
Array
(
    [0] => stdClass Object
        (
            [id] => 12
            [userid] => 001

        )

    [1] => stdClass Object
        (
            [id] => 13                
            [userid] => 002

        )

)

```

I want to display the userid values from both like "001, 002" as a string with comma separated.