# summing an array of arrays

#### Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

•  Subject
• Author
• Posted on
\$aryTemp=("A"=>Array(1,5,3),
"B"=>Array(15,20,52))

sum_subarrays_by_key(\$aryTemp, \$aryTemp[\$key]

function sum_subarrays_by_key(\$aryTemp, \$key)
sum=0;
foreach(\$aryTemp as \$sub_array){

\$sum += \$sub_array[\$key];}
}
return \$sum:
}

What I want to know how to do is change the above script to make it
add a 3rd array of arrays?
c=> Array(C1=> Array(17,4,8), C2=>Array(1,4,10))

thanks, Jan

## Re: summing an array of arrays

Am Fri, 15 Apr 2011 17:06:12 -0700 schrieb jr:

Good morning Jan.

First off: I didn't even look at your code.
I implemented the solution to your problem with recursion - from scratch.

The example call sums to 0, as I subtract the sum of all the arrays'
values (197) from it.

It's lacking safeguards, but as the only intention was to show you how to
do such a task.. ;)

*------------ snip -----------*
function recurseSumArray(\$arr){
\$sum=0;

foreach (\$arr as \$value){
if( ! is_array(\$value)){
\$sum += \$value;
}else{
\$sum += recurseSumArray(\$value);
}
}

return \$sum;
}

\$arr = array('A'=>array(7,4,2),
'B'=>array(2,42,-1, 105),
'C'=>array(0,2,1, 33),
-197);
\$sum = recurseSumArray(\$arr);

echo \$sum;
*------------------------------*

If you've got any questions, feel free to ask.

Yours,
Michael

## Re: summing an array of arrays

thanks I was trying to do it some more this morning and I was getting
the idea going but it is hard to think recursively so it helps to see
the example. I have some more like this thanks,