Unique values in a php array

If I have the following array:

Array (
[0] => Array ([0] => 2 [1] => 3 [2] => 1 )
[1] => Array ([0] => 2 [1] => 3 [2] => 3 )
[2] => Array ([0] => 2 [1] => 3 [2] => 1 )
[3] => Array ([0] => 2 [1] => 3 [2] => 3 )
[4] => Array ([0] => 2 [1] => 3 [2] => 1 )
[5] => Array ([0] => 2 [1] => 3 [2] => 3 )
[6] => Array ([0] => 2 [1] => 3 [2] => 1 )
[7] => Array ([0] => 2 [1] => 3 [2] => 3 )
)

PHP:

How can I get just the unique values?

I've tried array_unique but it's multi dimensional so I don't think it's having the required affect.

 

Ellaborate?

And can you provide your expected output?

 

Okay the output I want is the unique values within so:

Array (
[0] => Array ([0] => 2 [1] => 3 [2] => 1 )
[1] => Array ([0] => 2 [1] => 3 [2] => 3 )
)

PHP:

However with array_unique it's just giving:

Array ( [0] => Array ( [0] => 2 [1] => 3 [2] => 1 ) )

PHP:

 

serialize each entry, use array_unique on the resulting array, then unserialize each entry.