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

Just loop through and find unique values as you go:

$taken = array();

foreach($items as $key => $item) {
    if(!in_array($item['x'], $taken)) {
        $taken[] = $item['x'];
    } else {
        unset($items[$key]);
    }
}

Each the first time the x value is used, we save it - and subsequent usages are unset from the array.