Question

I have a PHP array:

$arr = array(1,2,3,3,4,6,6);

I want to find the location of either duplicate in each duplicate pair (either 3 and either 6) and reset that value using rand(1,8). How would I go about doing this? I essentially need to make sure all of the array values are different.

Answer 1

You can try

$arr = array(1,2,3,3,4,6,6);
$dup = array_diff_assoc($arr,array_unique($arr));
$v = mt_rand(1, 8);

foreach ( $dup as $k ) {
    while ( in_array($v, $arr) ) {
        $v = mt_rand(1, 8);
    }
    $arr[$k] = $v;
}

echo "<pre>";
print_r($arr);