- var_export: documentation ( source)
<?php
$array = [
[2015 => '2015'],
[2016 => '2016'],
[2017 => '2017'],
[2018 => '2018'],
[2019 => '2019'],
[2020 => '2020'],
[2021 => '2021'],
[2022 => '2022'],
[2023 => '2023']
];
$result = [];
foreach ($array as $row) {
foreach ($row as $k => $v) {
$result[$k] = $v;
}
}
var_export($result);