problem with array_unique variation

[adamalton]

I've got a multi-dimensional array that I'm trying to remove duplicate rows from. Like this:
[PHP]
$arr[]=array('biscuit ','cheese','cow ');
$arr[]=array('biscuit ','cheese','hor se');
$arr[]=array('biscuit ','cheese','hor se');
$arr[]=array(7,42,10) ;
$arr[]=array(7,34,10) ;
$arr[]=array(7,42,10) ;

[adamalton]

Dammit, that didn't post properly. Should have been this:

I've got a multi-dimensional array that I'm trying to remove duplicate rows from. Like this:
[PHP]
$arr[]=array('biscuit ','cheese','cow ');
$arr[]=array('biscuit ','cheese','hor se');
$arr[]=array('biscuit ','cheese','hor se');
$arr[]=array(7,42,10) ;
$arr[]=array(7,34,10) ;
$arr[]=array(7,42,10) ; [/PHP]

I'm trying to delete rows that are IDENTICAL (i.e. delete duplicate arrays), so I would want to delete the 'biscuit,cheese ,horse' array, and the duplicate '7,42,10' array, but not any of the others because I only want to delete if the entire row is an identical duplicate.

The array_unique function doesn't deal with multi-dimensional arrays, so I wrote some code that would (or should have!) done the job. I can't for the life of me work out why it doesn't work.

[PHP]
for($i=0; $i<($num_of_arr ays-1); $i++) //-1 because when you get to the last one there's no others to compare it to
{
for($j=$i+1; $j<$num_of_arra ys; $j++)
//$j is 1 more than $i, so that you start by comparing the NEXT row to the current one
{
$num_elements=c ount($arr[$i]);
for($k=0; $k<$num_element s; $k++)
{
if($arr[$i][$k] != $arr[$j][$k])
//if any of the values are NOT the same
{
$abort="yes";
}
}
if(!$abort)
unset($arr[$j]);
}
}

//this bit just re-arranges the keys so that there aren't any empty rows
foreach (array_keys($ar r) as $key)
{
if($arr[$key]) //if the element exists
$temp[]=$arr[$key];
}
$arr=$temp;[/PHP]