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array_udiff

Description

The array_udiff of Array for PHP computes the difference of arrays by using a callback function for data comparison.

Syntax

array_udiff(
    array $array,
    array ...$arrays,
    callable $value_compare_func
): array

Parameters

array

The array to compare from.

arrays

The arrays to compare against.

value_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 values of array that are not present in any of the other arguments.

Examples

1 · array arrays · one · value_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
];
$value_compare_func = "mycallback";

$return = array_udiff($array, $arrays, $value_compare_func);

print_r($return);

Array
(
    [b] => 1
    [d] => 3
)

2 · array arrays · multiple · value_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
];
$value_compare_func = "mycallback";

$return = array_udiff($array, $arrays1, $arrays2, $value_compare_func);

print_r($return);

Array
(
    [b] => 1
    [d] => 3
)