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@ 2023-11-21T02:09:00Z

<?php

$reasons = [
    "1" => [
        "101" => "reason1",
        "102" => "reason2",
    ],
    "2" => [
        "201" => "reason3",
        "202" => "reason4",
    ],
];

$newReasons = array_reduce($reasons, function ($list, $item) {
    // 配列のキーを維持するため + で結合
    return $list + $item;
}, []);

var_dump($newReasons);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_reduce: documentation ( source)

preferences:dark modelive previewkey bindings

86.79 ms | 405 KiB | 5 Q