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@ 2023-11-11T10:14:09Z

<?php

$lists = [
    ['A', 'B', 'C', 'D', 'E'],
    ['A', 'B', 'C', 'D'],
    ['A', 'B', 'C', 'D', 'E', 'F'],
];

foreach ($lists as &$row) {
    $newRow = [];
    foreach ($row as $i => $v) {
        $newRow['Key' . $i + 1] = $v;
    }
    $row = $newRow;
}
var_export($lists);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

30.42 ms | 404 KiB | 5 Q