PHP remove duplicate values from multidimensional array

You could serialize the sub-arrays (via serialize()) into a new array, then run array_unique() on that, and then unserialize the resulting set of arrays.

The user comments on the array_unique page do shed some light on this. You will most likely find some hidden gems in those comments - its a very handy documentation.

Just a quick browser through revealed the following to remove duplicates from a multi dimensional array:

<?php
function super_unique($array)
{
  $result = array_map("unserialize", array_unique(array_map("serialize", $array)));

  foreach ($result as $key => $value)
  {
    if ( is_array($value) )
    {
      $result[$key] = super_unique($value);
    }
  }

  return $result;
}
?>