php filter array values and remove duplicates from multi dimensional array

Question

Hello all im trying to find duplicate x values from this array and remove them and only leave the unique ones. For example my array is

Array
(
[0] => Arr         


        

Answer 1

array_unique compares string values, so you can create objects (with an overloaded __toString function) as an intermediate step.

class XKeyObj {
    public $x;
    public $y;

    public function XKeyObj($x, $y) {
        $this->x = $x;
        $this->y = $y;
    }

    public function __toString() { return strval($this->x); }
}

function array_to_xKey($arr) { return new XKeyObj($arr['x'], $arr['y']); }
function xKey_to_array($obj) { return array('x' => $obj->x, 'y' => $obj->y); }

$input = array(
    array('x' => 0.5, 'y' => 23),
    array('x' => 23, 'y' => 21.75),
    array('x' => 14.25, 'y' => 21.875),
    array('x' => 19.375, 'y' => 21.75),
    array('x' => 9.125, 'y' => 21.875),
    array('x' => 23, 'y' => 19.625),
    array('x' => 19.375, 'y' => 19.625)
);

$output = array_map('xKey_to_array',
                    array_unique(array_map('array_to_xKey', $input)));

print_r($output);

The result:

Array
(
    [0] => Array
        (
            [x] => 0.5
            [y] => 23
        )

    [1] => Array
        (
            [x] => 23
            [y] => 21.75
        )

    [2] => Array
        (
            [x] => 14.25
            [y] => 21.875
        )

    [3] => Array
        (
            [x] => 19.375
            [y] => 21.75
        )

    [4] => Array
        (
            [x] => 9.125
            [y] => 21.875
        )

)