Question

I have an array of products

$products = array_count_values($products);

now I have an array where $key is product number and $value is how many
times I have such a product in the array.
I want to sort this new array that product with the least “duplicates” are
on the first place, but what ever I use (rsort, krsort,..) i loose product
numbers (key).

any suggestions?

thanks.

Answer 1

Take a look at arsort() as an alternative to rsort() (and that family of functions).

Generally, the ‘Sorting arrays‘ page on php.net might be useful to you – it’s a comparison of PHP’s array sorting functions based on what they sort, what direction they sort in, and whether they maintain the keys while sorting.

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Mind you, for the sake of completion:

Going by ‘now I have an array where $key is product number and $value is how many times I have such a product in the array. I want to sort this new array that product with the least “duplicates” are on the first place‘, you probably want asort() (the pendant to sort()).

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Your comment example, using asort():

$arr = array(
    1 => 3,
    2 => 2,
    5 => 3,
    9 => 1
);
asort($arr);
print_r($arr);

yields:

Array
(
    [9] => 1
    [2] => 2
    [1] => 3
    [5] => 3
)