sorting - PHP array multiple sort - by value then by key?

Question

I have an array of string keys with numeric values for use in a list of tags with the number of occurances of each tag, thus:

$arrTags['mango'] = 2; 
$arrTags['orange'] = 4; 
$arrTags['apple'] = 2; 
$arrTags['banana'] = 3;

this is so i can display the tag list in descending occurance order thus:

orange (4)  
banana (3) 
mango (2) 
apple (2)

i can use arsort to reverse sort by the value which is brilliant but i also want any tags that have the same numeric value to be sorted alphabetically, so the final result can be:

orange (4)  
banana (3) 
apple (2) 
mango (2)

is there a way i can do this? i'm guessing that usort may be the way to go but i look at the examples on php.net and my eyes glaze over! many thanks!!!

Answer 1

As Scott Saunders hints in his comment to David's solution, you can use the array_keys() and array_values() functions to get rid of the loop. In fact, you can solve this in one line of code:

array_multisort(array_values($arrTags), SORT_DESC, array_keys($arrTags), SORT_ASC, $arrTags);