PHP Sum Children in Array - php

Question

Hey I have an array where I would like to sum the values of the first-level children at various levels of the array.
<?php
$group = Array('Electronics' => Array(
'6 - Cameras & Supplies' => Array(
'Cameras' => Array(
'Camcorders' => Array (
'Action Camcorders' => Array (
'total_ty_yest_sales' => 70.83,
'total_wo_dotcom_ty_yest_sales' => 401.59,
'east_ty_yest_sales' => 65.20
),
'Standard Camcorders' => Array (
'total_ty_yest_sales' => 96.09,
'total_wo_dotcom_ty_yest_sales' => 96.09,
'east_ty_yest_sales' => 68.21
),
'Surveillance' => Array(
'total_ty_yest_sales' => 84.00,
'total_wo_dotcom_ty_yest_sales' => 84.00,
'east_ty_yest_sales' => 26.00
)
),
'subCameras' => Array (
'Big Zoom' => Array(
'total_ty_yest_sales' => 31.66,
'total_wo_dotcom_ty_yest_sales' => 13.68,
'east_ty_yest_sales' => 1.47
),
'Pegged Cameras' => Array(
'total_ty_yest_sales' => 13.50,
'total_wo_dotcom_ty_yest_sales' => 5.50,
'east_ty_yest_sales' => 5.00
),
'Point-N-Shoot' => Array(
'total_ty_yest_sales' => 46.61,
'total_wo_dotcom_ty_yest_sales' => 10.35,
'east_ty_yest_sales' => 4.06
),
'Rugged Cameras' => Array(
'total_ty_yest_sales' => 87.04,
'total_wo_dotcom_ty_yest_sales' => 87.04,
'east_ty_yest_sales' => 65.20
),
'SLR' => Array(
'total_ty_yest_sales' => 50.19,
'total_wo_dotcom_ty_yest_sales' => 9.40,
'east_ty_yest_sales' => 1.37
)
)
) )
));
$totalSum = 0;
echo "<table>\n
<thead></thead>\n
<tbody>\n";
foreach($group as $gmm => $acctg_dept_nbrs) {
echo "<tr class=\"header\">\n
<td>" . $gmm . "</td>\n";
foreach ($acctg_dept_nbrs as $acctg_dept_nbr => $dept_catg_grp_descs) {
echo "<tr class=\"header\">\n
<td style=\"padding-left: 1em;\">" . $acctg_dept_nbr . "</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
$total_acctg_dept_nbr = 0;
foreach($dept_catg_grp_descs as $dept_catg_grp_desc => $dept_category_descs) {
echo "<tr class=\"header\">\n
<td style=\"padding-left: 2em;\">" . $dept_catg_grp_desc . "</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
$total_dept_catg_grp_desc = 0;
foreach($dept_category_descs as $dept_category_desc => $dept_subcatg_descs) {
echo "<tr class=\"header\">\n
<td style=\"padding-left: 3em;\">" . $dept_category_desc . "</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
echo "<td style=\"width:100px;\">SUM</td>\n";
foreach($dept_subcatg_descs as $dept_subcatg_desc => $values) {
echo "<tr>\n
<td style=\"padding-left: 4em;\">" . $dept_subcatg_desc . "</td>\n";
$sum = $values['total_ty_yest_sales'];
echo "<td style=\"width:100px;\">".$sum."</td>\n";
$sum = $values['total_wo_dotcom_ty_yest_sales'];
echo "<td style=\"width:100px;\">".$sum."</td>\n";
$sum = $values['east_ty_yest_sales'];
echo "<td style=\"width:100px;\">".$sum."</td>\n";
}
}
}
}
}
?>
I want to replace the "SUM"s in the output with the sum of the values of next level of indention.

Answer 1

This is not the most efficient thing to do, but you can create a function that calculates the sum of an array recursively:
function array_sum_recursive($array)
{
$sum = 0;
array_walk_recursive($array, function($item) use (&$sum) {
$sum += $item;
});
return $sum;
}