Compare 2-dimensional data sets based on a specified second level value

by

You can define a custom comparison function using array_udiff().

function udiffCompare($a, $b)
{
    return $a['ITEM'] - $b['ITEM'];
}

$arrdiff = array_udiff($arr2, $arr1, 'udiffCompare');
print_r($arrdiff);

Output:

Array
(
    [3] => Array
        (
            [ITEM] => 4
        )
)

This uses and preserves the arrays’ existing structure, which I assume you want.

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