Description:
------------
Requesting array_unique() function to work correctly with multi-dimensional arrays (or a new function that does the same thing, so as to retain backwards compatibility) 

Script:
===================================================
<?php

$array = array (1 => array(1, 2, 3),
                2 => array(1, 2),
                3 => array(1, 3, 4),
                4 => array(1, 2),
                5 => array(1, 3, 4)
               );

$array = array_unique ($array);

print_r ($array);

?>
===================================================

Current actual output:
===================================================
ludo:~/tmp/php-5.1-dev/array_unique# ../../php5-200507102230/sapi/cli/php ./test.php 
Array
(
    [1] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )

)
ludo:~/tmp/php-5.1-dev/array_unique# 
===================================================

Desired output:
===================================================
ludo:~/tmp/php-5.1-dev/array_unique# ../../php5-200507102230/sapi/cli/php ./test.php 
Array
(
    [1] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )

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

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

)
ludo:~/tmp/php-5.1-dev/array_unique# 
===================================================

Note the order of the keys isn't a big concern to me, although others may be concerned about this.

Various bogus bugs that people have logged when the encountering this behaviour:
Bug #16715, Bug #12690, Bug #13403, Bug #10891, Bug #12789, Bug #12528

I couldn't see a feature request for this though, so that's what this is.