array_diff_uassoc in PHP

Syntax of array_diff_uassoc

array array_diff_uassoc(array array1, array array2
[, … array arrayN], callable function)

Returns an array containing all the values in array1 that are not present in any of the other provided arrays. Unlike array_diff(), both the keys and values must match to be considered identical. The function function is used to compare the values of the elements for equality. The function is called with two parameters—the values to compare. It should return an integer less than 0 if the first argument is less than the second, 0 if the first and second arguments are equal, and an integer greater than 0 if the first argument is greater than the second. The keys of the values are preserved

Example of array_diff_uassoc in PHP

<?php
function key_compare_func($a, $b)
{
    if ($a === $b) {
        return 0;
    }
    return ($a > $b)? 1:-1;
}

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>

Output of array_diff_uassoc

Array
(
    [b] => brown
     => blue
    [0] => red
)