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<?php $str = 'Saturday-Thursday'; list($begin, $end) = explode('-', $str); $begin = new DateTime($begin); $end = new DateTime($end); $end = $end->modify( '+1 day' ); $interval = new DateInterval('P1D'); $daterange = new DatePeriod($begin, $interval, $end); $result = array_map(fn($d) => $d->format('l'), iterator_to_array($daterange)); print_r($result);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Array ( [0] => Saturday [1] => Sunday [2] => Monday [3] => Tuesday [4] => Wednesday [5] => Thursday )

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