How to remove all instances of duplicated values from an array

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:

Answer 1

You can use

$singleOccurences = array_keys(
    array_filter(
        array_count_values(
            array('banana', 'mango', 'banana', 'mango', 'apple' )
        ),
        function($val) {
            return $val === 1;
        }
    )
)

See

• array_count_values — Counts all the values of an array
• array_filter — Filters elements of an array using a callback function
• array_keys — Return all the keys or a subset of the keys of an array
• callbacks