Question

print "<ul>";
foreach ($arr as $value) {
    echo("<li>" . $value[storeid] . " " . ($value[dvdstock] + $value[vhsstock]) . "</li>");
}
print "</ul>";

Will output

•2 20
•2 10
•1 20
•1 20
•1 10

I was wondering how I would adapt this loop so it outputs the total values for each &value[storeid]

•1 50
•2 30

Thanks very much 🙂

Answer 1

Use another array to calculate the values you want:

// setup a quick place to store the data
$stores = array();
foreach ($arr as $value) {
    if(!isset($stores[$value['storeid']])){  // init check required to avoid Notices
        $stores[$value['storeid']] = $value['dvdstock'] + $value['vhsstock'];
    }else{
        $stores[$value['storeid']] += $value['dvdstock'] + $value['vhsstock'];
    }
}
ksort($stores);  // sort by storeid ASC

print "<ul>";
// loop through the new data
foreach ($stores as $id => $value) {
    echo("<li>" . $id . " " . ($value) . "</li>");
}
print "</ul>";

Demo Link