Question

I have a large array where I basically need to count the number of uniques:
example array

The end result I am looking for something like

$result = array(
    'A3D5' => array('P2' => 1, 'P3' => 1, 'P4' => 1, 'total' => 3),
    'AE5S' => array('P4' => 1, 'total' => 1)
);

I’ve tried foreaching through but can’t seem to figure out how to sort them into another key, something like $zone = "P{$array['zone']}"; $result[$zone][$prestige]++ or seems to kind of not work or just error.

Answer 1

$array = array(
    "denizen" => array
        (
            "prestige" => 2,
            "zone" => "A3D5",
            "scope_frag" => 765
        ),

    "생각" => array
        (
            "prestige" => 4,
            "zone" => "A3D5",
            "scope_frag" => 135
        ),

    "Ryans" => array
        (
            "prestige" => 3,
            "zone" => "A3D5",
            "scope_frag" => 78
        ),

    "지적인" => array
        (
            "prestige" => 2,
            "zone" => "AE5S",
            "scope_frag" => 481
        )
);
foreach ($array as $group) {
    $zones[$group["zone"]][] = $group["prestige"];
}
foreach ($zones as $name => $zone) {
    $total = count($zone);
    foreach ($zone as $prestige) {
        $result[$name]["P".$prestige] += 1;
    }
    ksort($result[$name]);
    $result[$name]["total"] = $total;
}
echo "<pre>";
print_r($result);
echo "</pre>";