How to Find Unique Values in Two Flat Arrays Using PHP?

Finding Unique Values in Two Flat Arrays

Given two flat arrays, determine the subset of values that occur exclusively in one of the arrays.

To find the unique values, we can leverage two PHP functions: array_diff() and array_merge().

$array1 = [64, 98, 112, 92, 92, 92];
$array2 = [3, 26, 38, 40, 44, 46, 48, 52, 64, 68, 70, 72, 102, 104, 106, 92, 94, 96, 98, 100, 108, 110, 112];

To find the values that are not present in both arrays, we can first calculate the difference between $array1 and $array2:

$diff1 = array_diff($array1, $array2);

This gives us the values unique to $array1. However, we also need to find the values unique to $array2:

$diff2 = array_diff($array2, $array1);

Finally, to combine both sets of unique values, we can use array_merge():

$fullDiff = array_merge($diff1, $diff2);

This line will output the following result:

Array (
    [0] => 3
    [1] => 26
    [2] => 38
    [3] => 40
    [4] => 44
    [5] => 46
    [6] => 48
    [7] => 52
    [8] => 68
    [9] => 70
    [10] => 72
    [11] => 102
    [12] => 104
    [13] => 106
    [14] => 108
    [15] => 110
)

This approach efficiently finds all the values that appear exclusively in one of the two flat arrays.

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