array_udiff_uassoc

Description
Syntax
Examples
Links

Description

The array_udiff_uassoc of Array for PHP computes the difference of arrays with additional index check, compares data and indexes by a callback function.

Syntax

array_udiff_uassoc(
    array $array,
    array ...$arrays,
    callable $value_compare_func,
    callable $key_compare_func
): array

Parameters

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

The comparison of keys (indices) is done also by the callback function key_compare_func. This behaviour is unlike what array_udiff_assoc() does, since the latter compares the indices by using an internal function.

Return

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

Examples

1 · array arrays · one · value_compare_func

<?

function mycallback1($mya, $myb)
{
    return $mya <=> $myb;
}
function mycallback2($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 = "mycallback1";
$key_compare_func = "mycallback2";

$return = array_udiff_uassoc($array, $arrays, $value_compare_func, $key_compare_func);

print_r($return);

Array
(
    [b] => 1
    [c] => 2
    [d] => 3
)

2 · array arrays · multiple · value_compare_func

<?

function mycallback1($mya, $myb)
{
    return $mya <=> $myb;
}
function mycallback2($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 = "mycallback1";
$key_compare_func = "mycallback2";

$return = array_udiff_uassoc($array, $arrays1, $arrays2, $value_compare_func, $key_compare_func);

print_r($return);

Array
(
    [b] => 1
    [c] => 2
    [d] => 3
)