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array_intersect_ukey

Description

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

Syntax

array_intersect_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 the values of array whose keys exist in all the arguments.

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";

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

print_r($return);

Array
(
    [a] => 0
    [b] => 1
)

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";

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

print_r($return);

Array
(
    [a] => 0
    [b] => 1
)