how to add a number to the array using php : i have an array and remainder is 4, how to add this number to the array. 
Help me to split this one.

    Array
    (
        [2] => 6
        [3] => 6
        [5] => 6
        [6] => 6
        [7] => 6
        [9] => 6
    )

  

     Array
        (
            [2] => 6+1
            [3] => 6+1
            [5] => 6+1
            [6] => 6+1
            [7] => 6+0
            [9] => 6+0
        )