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array_diff_ukey

Description

The array_diff_ukey of Array for PHP computes the difference of arrays using a callback function on the keys for comparison.

Syntax

array_diff_ukey(
    array $array,
    array ...$arrays,
    callable $key_compare_func
): array

Parameters

array

The array to compare from.

arrays

The arrays to compare against.

key_compare_func

The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

callback(
    mixed $a,
    mixed $b
): int

Return

Returns an array containing all the entries from array that are not present in any of the other arrays.

Examples

1 · array arrays · one · key_compare_func

<?

function mycallback($mya, $myb)
{
    return $mya <=> $myb;
}

$array =
[
    "a" => 0,
    "b" => 1,
    "c" => 2,
    "d" => 3
];
$arrays =
[
    "a" => 0,
    "b" => 4,
    "e" => 2,
    "f" => 5
];
$key_compare_func = "mycallback";

$return = array_diff_ukey($array, $arrays, $key_compare_func);

print_r($return);
Array
(
    [c] => 2
    [d] => 3
)

2 · array arrays · multiple · key_compare_func

<?

function mycallback($mya, $myb)
{
    return $mya <=> $myb;
}

$array =
[
    "a" => 0,
    "b" => 1,
    "c" => 2,
    "d" => 3
];
$arrays1 =
[
    "a" => 0,
    "b" => 4,
    "e" => 2,
    "f" => 5
];
$arrays2 =
[
    "a" => 0,
    "b" => 4,
    "e" => 2,
    "f" => 5
];
$key_compare_func = "mycallback";

$return = array_diff_ukey($array, $arrays1, $arrays2, $key_compare_func);

print_r($return);
Array
(
    [c] => 2
    [d] => 3
)