<?php $dates = ['20240228', '20240229', '20240301']; $groups = []; foreach ($dates as $date) { $date = new DateTime($date); $groups[$date->format('F')][] = $date->format('j'); } echo implode( ' & ', array_map( fn($j, $F) => implode(', ', $j) . " $F", $groups, array_keys($groups) ) );
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