2 different array with different values - php

Question

My question may sound abit silly, but I know it is possible to do. I'm actually trying to make the array from mysql to be different from the array I have shuffle it already. I want to maintain the array keys, just the value in different order.
Here is the example,
Array from MYSQL:
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
[6] => 7
[7] => 8
)
Array after shuffle:
Array
(
[0] => 3
[1] => 7
[2] => 8
[3] => 4
[4] => 1
[5] => 2
[6] => 5
[7] => 6
)
If you notice, MYSQL array key 3 has the same value as shuffle array, I want it to be different. How can I do so?
Here is my code:
function get_random_elements($array) {
$ori_array = $array;
echo "<pre>";
print_r($ori_array);
echo "</pre>";
shuffle($array);
echo "<pre>";
print_r($array);
echo "</pre>";
for($x=0; $x<count($array); $x++) {
if ($array[$x] == $ori_array[$x])
{
$dupliarray[] = "Array value: ".$array[$x]." Key :".$x;
unset($array[$x]);
}
}
echo "<pre>";
print_r($dupliarray);
echo "</pre>";
}
$mysql_array = array(0=>'1',1=>'2',2=>'3',3=>'4',4=>'5',5=>'6',6=>'7',7=>'8');
get_random_elements($mysql_array);

Answer 1

One solution can be to shuffle array until it became totally differ from source array:
$sourceArray = [0, 1, 2, 3, 4, 5, 6, 7, 8];
$shuffledArray = $sourceArray; //because function shuffle will change passed array
shuffle($shuffledArray);
while (count(array_intersect_assoc($sourceArray, $shuffledArray))) {
shuffle($shuffledArray);
}
echo '<pre>';
var_dump($sourceArray, $shuffledArray);

Answer 2

I suggest this variant: Code in sandbox
$startArray = [
0 => 1,
1 => 2,
2 => 3,
3 => 4,
4 => 5,
5 => 6,
6 => 7,
];
function getShuffledArray($startArray) {
$shuffledArray = [];
// save value of last element for situation when we have last 2 elements of start array and one of them - last
$lastElement = end($startArray);
while (count($startArray)) {
$candidateIndex = array_rand($startArray);
if ($candidateIndex == count($shuffledArray)) {
while ($candidateIndex == count($shuffledArray)) {
$candidateIndex = array_rand($startArray);
}
}
$shuffledArray[] = $startArray[$candidateIndex];
unset($startArray[$candidateIndex]);
// shuffle last two elements when one of them last (in start array)
if (count($startArray) == 2 && end($startArray) == $lastElement) {
$shuffledArray[] = end($startArray);
$shuffledArray[] = reset($startArray);
$startArray = [];
}
}
return $shuffledArray;
}
$shuffledArray = getShuffledArray($startArray);
print_r ($shuffledArray);