What the best way to take an array with mostly the same (title, code) but different parentDrupalTermId

Array
(

    [0] => Array
        (
            [title] => Camps
            [code] => 16
            [parentDrupalTermId] => 645
        )

    [1] => Array
        (
            [title] => Camps
            [code] => 16
            [parentDrupalTermId] => 647
        )
     ...
)

and create a new array with munged single entry using an array for parentDrupalTermId:

Array
(

    [0] => Array
        (
            [title] => Camps
            [code] => 16
            [parentDrupalTermId] => [645, 647]
        )
     ...
)

This would be only for duplicate (title, code) entries

Thoughts?