How to find difference between two arrays in PHP?

Question

Here is array 1:

Array ( [ABC01] => 10.123.456.78
        [ABC02] => 10.123.456.79
        [ABC03] => 10.123.456.80
        [ZYX99] => 10.123.456         


        

Answer 1

This should work for you:

(Here I just used array_diff_key() to get the difference of the keys. The second array I flipped with array_flip() so to change the values to keys)

<?php

    $arr1 = array(
            "ABC01" => "10.123.456.78",
            "ABC02" => "10.123.456.79",
            "ABC03" => "10.123.456.80",
            "ZYX99" => "10.123.456.81"
    );

    $arr2 = array("ABC01", "ABC02", "ABC03");

    $result = array_diff_key ($arr1, array_flip($arr2));
    print_r($result);

?>

Output:

Array ( [ZYX99] => 10.123.456.81 )