Sum a multi dimensional array

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I have a multi dimensional array called $prescriptions.

I want to sum all the values in $prescriptions[copay].

I have tried

$totalcopay=array_sum($profile[copay]);

With no sucess, PHP gives a "You must pass an array to array_sum" error. Any Ideas?

[leatherback]

Let's start of with saying I do not know anything about this command.

BUT:

Have you tried :

$copay = $profile[copay];

$totalcopay=array_sum($copay);

J.

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Actually... The array is

$profile[COUNT][copay]

to complicate matters

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If anyones interested here is how I solved it...

foreach($profile as $key=>$value)
{
$row=& $profile[$key];
$sumall[]=$row[copay];
}

$totalcopay=array_sum($sumall);