Sum values of multi-dimensional array in PHP

How would I calculate the sum of these two values inside this multi-dimensional array?

Array
(
    [Dec 01, 2013] => Array
        (
            [COM] => Array
                (
                    [C] => Array
                        (
                            [T] => 620.25
                            [U] => 24.75
                        )

                )

        )

)

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DanielAttardAsked:
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gplanaCommented:
if your array is on a variable called $a try this:

$sum = 0;
foreach($e1 in $a) {
   foreach($e2 in $e1){
      foreach($e3 in $e2){
         foreach($e4 in $e3){
            $sum += $e4;
         }
      }
   }
}
// here the $sum variable has the sum of the values.
gplanaCommented:
Sorry, last code is not correct. Try this:

$sum = 0;
foreach($a as $e1) {
   foreach($e1 as $e2){
      foreach($e2 as $e3){
         foreach($e3 as $e4){
            $sum += $e4;
         }
      }
   }
}
// here the $sum variable has the sum of the values. 

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You can see the foreach statement help here: http://www.php.net/manual/en/control-structures.foreach.php

Hope it helps. Regards!

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Marco GasiFreelancerCommented:
echo $array['Dec 01, 2013']['COM']['C']['T'] + $array['Dec 01, 2013']['COM']['C']['U'];

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gplanaCommented:
The marqusG solution is easier than mine, however my solution works for any array with 4 dimensions (as the array of your example).

MarqusG solution will only work on this specific example (with these values) while my solution will work for any 4-dimension array.

Hope it helps. Regards.
Marco GasiFreelancerCommented:
Yes, it's true. Depending on your specific needs, one solution is better than the other: if you know  the array structure, the array keys and the exact position of the values you need to sum, my solution is more concise and less expensive in terms of resources since it doesn't require to loop through the whole array.

But if you need a more abstract and flexible routine, then gplana's solution is the one which fits you needs.

Reading the question, I have choosen the quicker solution. :)

Cheers
Ray PaseurCommented:
See also the examples on the PHP man page:
http://php.net/manual/en/function.array-sum.php
DanielAttardAuthor Commented:
Thanks to everyone for the comments.  I learned from all of them.
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