Array
(
    [0] => WP_Term Object
        (
            [term_id] => 11
            [name] => Black
            [slug] => black
            [term_group] => 0
            [term_taxonomy_id] => 11
            [taxonomy] => pa_color
            [description] => 
            [parent] => 0
            [count] => 389
            [filter] => raw
            [term_order] => 0
        )

    [1] => WP_Term Object
        (
            [term_id] => 7974
            [name] => Red Rock
            [slug] => red-rock
            [term_group] => 0
            [term_taxonomy_id] => 7974
            [taxonomy] => pa_color
            [description] => 
            [parent] => 0
            [count] => 1
            [filter] => raw
            [term_order] => 0
        )

)

Array
(
    [0] => red-rock
    [1] => black
)

Array
(
)

Array
(
)