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@ 2021-07-29T12:24:45Z

<?php

$array = range(1, 3);
$result = [];
foreach ($array as $shifter => $unused) {
    foreach ($array as $index => $value) {
        $key = $shifter + $index;
        $result[$key] = ($result[$key] ?? 0) + $value;
    }
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
range: documentation ( source)

preferences:dark modelive previewkey bindings

28.58 ms | 405 KiB | 5 Q