PHP: filtering 2 dimensional array / multidimensional array

Question

hi all, i need help on filtering my 2 dimensional array such as example below:

array(29) { 
    [0]=>  array(2) { 
        [0]=>  string(16) "Andorra La Vella" 
        [1]=>  string(2) "AD"
    }
    [1]=>  array(2) { 
        [0]=>  string(16) "Andorra La Vella" 
        [1]=>  string(2) "AD" 
    }
    [2]=>  array(2) { 
        [0]=>  string(16) "Andorra La Vella" 
        [1]=>  string(2) "AD" 
    }
    [3]=>  array(2) { 
        [0]=>  string(16) "Andorra La Vella" 
        [1]=>  string(2) "AD" 
    }
    [4]=>  array(2) { 
        [0]=>  string(12) "Les Escaldes" 
        [1]=>  string(2) "AD" 
    }...

how do i filter any redundant value from my array? such as key[0] has the same value as key[1][2][3] and i want to remove this redundant value from my array.

i tried array_filter() but no luck. i tried array_splice() and unset(), no luck in either one.

does php provides any native array function for this?

thanks,
aji

Answer 1

Can array_unique() do this? Not sure if it works with nested arrays.

EDIT: no, it can't do it.

Note: Note that array_unique() is not intended to work on multi dimensional arrays.

Answer 2

If you want to remove duplicates you can find some more info on another thread

Enjoy!

Answer 3

    $to_filter = array(); // your array
    $filtered = array(); // unique values

    array_walk($to_filter, function($v, $k) use (&$filtered) {
        if(!in_array($v, $filtered)) {
            $filtered[] = $v;
        }
    });

And how clean it looks with PHP 5.3's anonymous functions..,.