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@ 2016-03-12T01:03:53Z

<?php
$masterArray = [
    [
        'GB' => 20827,
        'US' => 73,
        'ES' => 23
    ],
    [
        'GB' => 15070,
        'US' => 3920
    ]
];


$final = [];
foreach($masterArray as $subArray) {
    foreach($subArray AS $key => $value) {
        $final[$key] = isset($final[$key])
            ? $final[$key] + $value
            : $value;
    }
}

print_r($final);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)

preferences:dark modelive previewkey bindings

25.07 ms | 404 KiB | 5 Q