php return only duplicated entries from an array

Question

I want to retrieve all duplicated entries from a array. Is this possible in PHP?

array(     1 => '1233',     2 => '12334',     3 => 'Hello',     4 => 'hello',     5 => 'U' ); 

I want to return an array with just the duplicate value: “hello”.

Desired output array:

array(     1 => 'Hello',     2 => 'hello' ); 

Answer 1

function get_duplicates ($array) {     return array_unique( array_diff_assoc( $array, array_unique( $array ) ) ); }