In PHP there is a very useful function called array_count_values. It sorts an array by returning a 2 dimensional array consisting of non duplicate elements as keys, and values determined by how many times these elements appeared in the original array.

So, for example, an array [“red”,”green”,”blue”,”red”] would be converted into [“red” => 2, “green” =>1, “blue” => 1]. Duplicate elements are removed and the new array indicates how many times each, now unique value occurred in the array.

Unfortunately, Actionscript has no such function built in, so I made one. It is a modification of Senocular’s array.unique() prototype (which you can find in his Actionscript library), however rather than simply returning a unique array, it returns the 2 dimensional array mentioned above. Read : AS2 Array count values »