I want to traverse this array and display, 'comment' as bullet points.

```
Array
(
    [1] => Array
        (
            [id] => 1
            [comment] => a
            [parent_id] => 0
            [children] => Array
                (
                    [3] => Array
                        (
                            [id] => 3
                            [comment] => c
                            [parent_id] => 1
                            [depth] => 0
                            [child_count] => 0
                            [children] => 
                        )

                    [4] => Array
                        (
                            [id] => 4
                            [comment] => d
                            [parent_id] => 1
                            [depth] => 0
                            [child_count] => 0
                            [children] => 
                        )

                )

            [depth] => 1
            [child_count] => 2
        )

    [2] => Array
        (
            [id] => 2
            [comment] => b
            [parent_id] => 0
            [children] => Array
                (
                    [5] => Array
                        (
                            [id] => 5
                            [comment] => e
                            [parent_id] => 2
                            [children] => Array
                                (
                                    [7] => Array
                                        (
                                            [id] => 7
                                            [comment] => g
                                            [parent_id] => 5
                                            [children] => Array
                                                (
                                                    [8] => Array
                                                        (
                                                            [id] => 8
                                                            [comment] => h
                                                            [parent_id] => 7
                                                            [children] => Array
                                                                (
                                                                    [9] => Array
                                                                        (
                                                                            [id] => 8
                                                                            [comment] => h
                                                                            [parent_id] => 8
                                                                            [children] => Array
                                                                                (
                                                                                    [10] => Array
                                                                                        (
                                                                                            [id] => 8
                                                                                            [comment] => h
                                                                                            [parent_id] => 9
                                                                                            [depth] => 0
                                                                                            [child_count] => 0
                                                                                            [children] => 
                                                                                        )

                                                                                )

                                                                            [depth] => 1
                                                                            [child_count] => 1
                                                                        )

                                                                )

                                                            [depth] => 2
                                                            [child_count] => 1
                                                        )

                                                )

                                            [depth] => 3
                                            [child_count] => 1
                                        )

                                )

                            [depth] => 4
                            [child_count] => 1
                        )

                    [6] => Array
                        (
                            [id] => 6
                            [comment] => f
                            [parent_id] => 2
                            [depth] => 0
                            [child_count] => 0
                            [children] => 
                        )

                )

            [depth] => 5
            [child_count] => 2
        )

)

```