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@ 2025-02-03T22:15:56Z

<?php

$array = [
    [1 => 2],
    [1 => 2],
    [2 => 1],
    [3 => 1],
];

$result = [];
foreach ($array as $row) {
    $k = key($row);
    if (!isset($ref[$k])) {
        $ref[$k] = 0;
        $result[][$k] =& $ref[$k];
    }
    $ref[$k] += $row[$k];
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
key: documentation ( source)

preferences:dark modelive previewkey bindings

30.77 ms | 405 KiB | 5 Q