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

There is no existing function; You'll have to do this in two passes, one to count the unique values and one to extract the unique values:

$count = array();
foreach ($values as $value) {
  if (array_key_exists($value, $count))
    ++$count[$value];
  else
    $count[$value] = 1;
}

$unique = array();
foreach ($count as $value => $count) {
  if ($count == 1)
    $unique[] = $value;
}