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@ 2018-10-23T14:10:15Z

<?php

$nums = [];

for ($i = 1; $i <= 24; $i++) {
    $nums[] = $i;
}

print_r($nums);

$days = [];
foreach ($nums as $num) {
    $day = array_rand($nums);
    $days[] = $day;
    unset($nums[$day]);
}

print_r($nums);
print_r($days);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_rand: documentation ( source)

preferences:dark modelive preview

33.11 ms | 402 KiB | 5 Q