PHP Multidimensional Arrays - Remove Duplicates

Question

if anyone could please help me here I would be eternally grateful as I\'ve spent about 2 full days now trying to get this to work. I want to take two multidimensional arrays

Answer 1

I don't know how to do it with any built-in PHP function but here's a custom one:

$array1 = array(
  array( 'id' => 3, 'name' => 'Eye Colour' ),
  array( 'id' => 1, 'name' => 'Hair Colour' ),
  array( 'id' => 5, 'name' => 'Hair Length' ),
  array( 'id' => 4, 'name' => 'Height' ),
); 

$array2 = array(
  array( 'attribute_id' => 3, 'name' => 'Eye Colour', 'active' => 1 ),
  array( 'attribute_id' => 5, 'name' => 'Hair Length', 'active' => 1 )
);

// function to remove duplicates
function myArrayDiff($array1, $array2) {
    // loop through each item on the first array
    foreach ($array1 as $key => $row) {
        // loop through array 2 and compare
        foreach ($array2 as $key2 => $row2) {
            if ($row['id'] == $row2['attribute_id']) {
                // if we found a match unset and break out of the loop
                unset($array1[$key]);
                break;
            }
        }
    }

    return array_values($array1);
}

$array3 = myArrayDiff($array1, $array2);

print_r($array3);

/* result:
    Array
    (
        [0] => Array
            (
                [id] => 1
                [name] => Hair Colour
            )

        [1] => Array
            (
                [id] => 4
                [name] => Height
            )

    )
*/