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<?php $nums = []; for ($i = 1; $i <= 24; $i++) { $nums[] = $i; } print_r($nums); $days = []; for ($i = 1; $i <= 24; $i++) { $day = array_rand($nums); $days[] = $day; unset($day); } print_r($nums); print_r($days);

preferences:
32.17 ms | 402 KiB | 5 Q