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<?php $array = [ [2015 => '2015'], [2016 => '2016'], [2017 => '2017'], [2018 => '2018'], [2019 => '2019'], [2020 => '2020'], [2021 => '2021'], [2022 => '2022'], [2023 => '2023'] ]; var_export(array_reduce($array, 'array_merge', []));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '2015', 1 => '2016', 2 => '2017', 3 => '2018', 4 => '2019', 5 => '2020', 6 => '2021', 7 => '2022', 8 => '2023', )

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