Counting values in array [closed] - php

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I am trying to get values from this array and counting them. Let's say we have Amsterdam and I would like to count value [41, 21, 43] together and put them in a html table. The problem is that the values sometimes miss as you can see below. How can I achieve this?
Array
(
[Amsterdam] => Array
(
[41] => 2
[21] => 91
[43] => 16
[42] => 2
[20] => 30
[4] => 4
[70] => 3
[84] => 8
[46] => 4
[45] => 5
[999] => 26
[47] => 2
[3] => 8
[44] => 1
[40] => 1
[93] => 5
[56] => 3
[61] => 3
[79] => 3
[48] => 2
[50] => 5
[10] => 10
[52] => 2
[120] => 1
[95] => 1
[1] => 64
[90] => 4
[100] => 2
[101] => 1
)
[Rotterdam] => Array
(
[21] => 42
[41] => 2
[42] => 2
[46] => 1
[47] => 2
[43] => 4
[45] => 3
[4] => 1
[3] => 19
[84] => 1
[12] => 1
[20] => 14
[40] => 1
[48] => 6
[61] => 1
[52] => 1
[10] => 4
[1] => 23
[90] => 2
)
[Spaarnwoude] => Array
(
[21] => 2
)
This is what I already tried:
foreach ($headings as $h) {
echo "<th>$h</th>";
}
echo '</tr>';
foreach($cities as $cityname => $city) {
echo '<tr>';
echo "<td>$cityname</td>";
foreach (array_chunk($headings, 3) as $h) {
echo '<td>' . (isset($city[$h]) ? $city[$h] : '0') . '</td>';
}
echo '</tr>';
}
echo '</table>';
For further information you can check this link.
How to get array output in html table

Answer 1

You need another level of looping for each heading in the chunks.
$chunked_headings = array_chunk($headings, 3);
echo '<tr>';
foreach ($chunked_headings as $heading_group) {
echo '<th>' . implode(', ', $heading_group) . '</th>';
}
echo '</tr>';
foreach ($cities as $cityname => $city) {
echo '<tr>';
echo "<td>$cityname</td>";
foreach ($chunked_headings as $heading_group) {
$total = 0;
foreach ($heading_group as $h) {
if (isset($city[$h])) {
$total += $city[$h];
}
}
echo "<td>$total</td>";
}
}