计算1个数组的重复键并更新第二个数组的匹配值

Question

I am trying to count the duplicate keys from array $new_result_months, remove them and update the value of $new_result_users with the matching key. if I would do an array_combine every key should match the value. I really tried but did not managed to think of a version.

$new_result_months = array(  
                        'Dec 2013',
                        'Jan 2014',
                        'Feb 2014',
                        'Mar 2014',
                        'Apr 2014',
                        'May 2014',
                        'Jun 2014',
                        'Jul 2014',
                        'Aug 2014',
                        'Sep 2014',
                        'Oct 2014', 
                        'Oct 2014', // remove one duplicate key and keep unique one
                        'Nov 2014', 
                        'Nov 2014', // remove one duplicate key and keep unique one
                        'Nov 2014', // remove one duplicate key and keep unique one
                        'Dec 2014'
                    );
$new_result_users = array(
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          1,
                          0,
                          1,
                          1,
                          0
                    );

EXPECTED OUTPUT

$new_result_months = array(  
                        'Dec 2013',
                        'Jan 2014',
                        'Feb 2014',
                        'Mar 2014',
                        'Apr 2014',
                        'May 2014',
                        'Jun 2014',
                        'Jul 2014',
                        'Aug 2014',
                        'Sep 2014',
                        'Oct 2014',
                        'Nov 2014',
                        'Dec 2014'
                    );

$new_result_users = array(
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          0,
                          1,  // needs to match with month oct 2014 and update it to 1
                          2, // needs to match with month nov 2014 and update it to 2
                          0
                    );

Answer 1

First you count the duplicated values with array_count_values:

$aux = array_count_values($new_result_months);

The new created array $aux will have this values:

['Dec 2013'] => 1
['Jan 2014'] => 1
['Feb 2014'] => 1
['Mar 2014'] => 1
['Apr 2014'] => 1
['May 2014'] => 1
['Jun 2014'] => 1
['Jul 2014'] => 1
['Aug 2014'] => 1
['Sep 2014'] => 1
['Oct 2014'] => 2 
['Nov 2014'] => 3
['Dec 2014'] => 1

Then, with a foreach loop, you can create the new arrays that you want:

foreach($aux as $key => $value) {
    $new_result_months[] = $key;
    $new_result_users[] = $value;
}