<?php $days = "Mon[3,9,11,24,25] Tue[1,2,3,9,11,15,16] Wed[5,9] Thu[5] Fri[5,11,24] Sat[5,11,30] Sun[4,10,28,29]"; $individualDays = explode(' ', $days); $result = []; foreach ($individualDays as $individualDay) { $dates = preg_match_all('/\d+/', $individualDay, $matches); $result[substr($individualDay, 0, 3)] = $matches[0]; } var_dump($result);
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