<?php $array = [ [2015 => '2015'], [2016 => '2016'], [2017 => '2017'], [2018 => '2018'], [2019 => '2019'], [2020 => '2020'], [2021 => '2021'], [2022 => '2022'], [2023 => '2023'] ]; $result = []; array_walk_recursive($years, function($v, $k) use (&$result) { $result[$k] = $v; }); var_export($result);
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Value for `_results` contains invalid data `array`