How to flatten a 2d array by converting each row into a formatted string
06:14 23 Aug 2014

I’ve got an array which looks like this:

Array
(
    [0] => Array
        (
            [0] => Thomas
            [1] => Jansen
        )

    [1] => Array
        (
            [0] => Lisa
            [1] => Meier
        )

    [2] => Array
        (
            [0] => Gerda
            [1] => Ohm
        )
)

What I would like to achieve is an array like this:

Array
(
    [0] => "Jansen, Thomas"
    [1] => "Meier, Lisa"
    [2] => "Ohm, Gerda"
)
php arrays string-formatting