CODEWITHSUNDEEP
phparraysrandom
gadss
gadss

Reputation: 22489

Randomize some elements inside an array

Hi I have a set or array:

$arr = ['1','2','3','4','5','6','7','8','9','0'];
shuffle($arr);

this will return the randomized order of the array. but how can I code if the '3','4' and '8','9','0' must together? I mean the other value can go random order but these '3','4' and '8','9','0' must join together.

Upvotes: 0

Views: 44

Answers (2)

Kevin
Kevin

Reputation: 41885

Another way would be to get those ordered elements first (another copy), then shuffle the original, then remerge them again with union:

$arr = ['1','2','3','4','5','6','7','8','9','0'];
$arr2 = array_filter($arr, function($e){ // get those elements you want preversed
    return in_array($e, [3, 4, 8, 9, 0]);
});
shuffle($arr); // shuffle the original
$ordered = $arr2 + $arr; // use union instead of array merge
ksort($ordered); // sort it by key

print_r($ordered);

Sample Output

Upvotes: 2

VolkerK
VolkerK

Reputation: 96159

Many possible solutions, one example

<?php
$arr = ['1','2',['3','4'],'5','6','7',['8','9','0']];
shuffle($arr);
// and then flatten the array  ..somehow, e.g.
array_walk_recursive($arr, function($e) { echo $e, ' '; });

Upvotes: 1

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