array_udiff_assoc

(PHP 5, PHP 7)

array_udiff_assoc — Computes the difference of arrays with additional index check, compares data by a callback function

설명

array array_udiff_assoc ( array $array1 , array $array2 [, array $... ], callable $value_compare_func )

Computes the difference of arrays with additional index check, compares data by a callback function.

Note: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_udiff_assoc($array1[0], $array2[0], "some_comparison_func");.

인수

array1: The first array.
array2: The second array.
value_compare_func: 이 비교 함수는 첫번째 인수가 두번째 인수보다 작거나, 같거나, 클 경우에 각각 0보다 작거나, 같거나, 큰 정수를 반환해야 합니다.

int callback ( mixed $a, mixed $b )

반환값

array_udiff_assoc() returns an array containing all the values from array1 that are not present in any of the other arguments. Note that the keys are used in the comparison unlike array_diff() and array_udiff(). The comparison of arrays' data is performed by using an user-supplied callback. In this aspect the behaviour is opposite to the behaviour of array_diff_assoc() which uses internal function for comparison.

예제

Example #1 array_udiff_assoc() example


<?php
class cr {
    private $priv_member;
    function cr($val)
    {
        $this->priv_member = $val;
    }

    static function comp_func_cr($a, $b)
    {
        if ($a->priv_member === $b->priv_member) return 0;
        return ($a->priv_member > $b->priv_member)? 1:-1;
    }
}

$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);

$result = array_udiff_assoc($a, $b, array("cr", "comp_func_cr"));
print_r($result);
?>

위 예제의 출력:

Array
(
    [0.1] => cr Object
        (
            [priv_member:private] => 9
        )

    [0.5] => cr Object
        (
            [priv_member:private] => 12
        )

    [0] => cr Object
        (
            [priv_member:private] => 23
        )
)

In our example above you see the "1" => new cr(4) pair is present in both arrays and thus it is not in the output from the function.

참고

array_diff() - 배열 차이를 계산
array_diff_assoc() - 추가적인 인덱스 확인과 함께 배열 차이를 계산
array_diff_uassoc() - Computes the difference of arrays with additional index check which is performed by a user supplied callback function
array_udiff() - 데이터 비교 콜백함수를 사용하여 배열간의 차이를 계산
array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
array_intersect() - 배열의 교집합을 계산
array_intersect_assoc() - 인덱스 검사과 함께 배열의 교집합을 계산
array_uintersect() - Computes the intersection of arrays, compares data by a callback function
array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions

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User Contributed Notes 2 notes

down

-6

m dot ario dot huq at gmail dot com ¶

6 years ago


The example #1 can be modified (PHP 7 or higher) by using Spaceship operator (<=>):

<?php
//…
static function comp_func_cr($a, $b)
{
    return $a->priv_member <=> $b->priv_member;
}
//…
?>

down

-12

tmquang6805 at yahoo dot com ¶

10 years ago


Difference between array_udiff_assoc() and array_diff_assoc()

- array_udiff_assoc(): Compares the DATA with the user supplied callback function
- array_diff_assoc(): Compares the INDEX with the user supplied callback function

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