<?php $dates = ['20-05-2015', '02-01-2015', '30-03-2015', '10-01-1990']; usort($dates, fn($a, $b) => strtotime($a) <=> strtotime($b)); printf( "Latest Date: %s\nEarliest Date: %s", $dates[array_key_last($dates)], $dates[0] );
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