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@ 2023-05-25T15:26:05Z

<?php

$months = [
    '2023-04',
    '2023-03',
    '2023-04',
    '2023-04',
    '2023-02',
];

$amounts = [
    833,
    223,
    829,
    220,
    498
];

$sums = [];

foreach($months as $i => $month) {
    if (!isset($sums[$month])) {
        $sums[$month] = 0;
    }
    
    $sums[$month] += $amounts[$i];
}

var_dump($sums);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

60.91 ms | 404 KiB | 5 Q