How to remove all instances of duplicated values f

Question

I know there is array_unique function, but I want to remove duplicates. Is there a built-in function or do I have to roll my own.

Example input:

banna, banna, mango, mango, apple

Expected output:

apple

Answer 1

PHP.net http://php.net/manual/en/function.array-unique.php

array array_unique ( array $array [, int $sort_flags = SORT_STRING ] )

Takes an input array and returns a new array without duplicate values.

---

New solution:

function remove_dupes(array $array){
    $ret_array = array();
    foreach($array as $key => $val){
        if(count(array_keys($val) > 1){
            continue;
        } else { 
            $ret_array[$key] = $val; 
        }
}

Answer 2

Only partially relevant to this specific question - but I created this function from Gumbo's answer for multi dimensional arrays:

function get_default($array)
{
    $default = array_column($array, 'default', 'id');
    $array = array_diff($default, array_diff_assoc($default, array_unique($default)));

    return key($array);
}

In this example, I had cached statuses and each one other than the default was 0 (the default was 1). I index the default array from the IDs, and then turn it into a string. So to be clear - the returned result of this is the ID of the default status providing it's in the same part of the multi dimensional array and not the key of it

Answer 3

If you want to only leave values in the array that are already unique, rather than select one unique instance of each value, you will indeed have to roll your own. Built in functionality is just there to sanitise value sets, rather than filter.