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