PHP - shuffle only part of an array

Question

I have an array as so:

$animals = array (
    \'giraffe\',
    \'lion\',
    \'hippo\',
    \'dog\',
    \'cat\',
    \'rabbit\',
    \'fly\',
    \'hamster\         


        

Answer 1

function shuffle_include($a, $include_indexes)    
{    
    $b = array();    
    foreach ($include_indexes as $i => $v)    
        $b[] = $a[$v];    
            
    shuffle($b);    
    
    foreach ($include_indexes as $i => $v)    
        $a[$v] = $b[$i];    
     
    return $a;    
}

Example:

$animals = array (
'giraffe',
'lion',
'hippo',
'dog',
'cat',
'rabbit',
'fly',
'hamster',
'gerbil',
'goldfish');

$new_animals = shuffle_include($animals, array(7,8));