Associative Arrays Calcualtion
<p>Hey i have result array like this (below).</p>

<pre>
Array
(
    [10] => Array
        (
            [0] => Array
                (
                    [iPlannedCourseId] => 56
                    [fCreditHours] => 15.25
                )

            [1] => Array
                (
                    [iPlannedCourseId] => 57
                    [fCreditHours] => 14.50
                )

        )

    [11] => Array
        (
            [0] => Array
                (
                    [iPlannedCourseId] => 58
                    [fCreditHours] => 12.25
                )

            [1] => Array
                (
                    [iPlannedCourseId] => 59
                    [fCreditHours] => 14.75
                )

            [2] => Array
                (
                    [iPlannedCourseId] => 60
                    [fCreditHours] => 15.25
                )

        )

)
</pre>

<p>I want summing of fCreditHours as per Parent Key. Is there any function without use of looping
i.e.,
<pre>
Array 
(
        [10] = > 29.75
        [11] = > 42.25
)
</Pre></p>
