- array_map: documentation ( source)
- var_dump: documentation ( source)
- sort: documentation ( source)
<?php
$input = [
"2021-01-01",
"2019-05-23",
"2022-09-13",
];
$dates = array_map(
function (string $dateString) {
return (new \DateTimeImmutable($dateString))->format("Y-m-d");
},
$input
);
sort($dates);
var_dump($dates);