array_intersect_ukey

(PHP 5 >= 5.1.0, PHP 7)

array_intersect_ukey — Computes the intersection of arrays using a callback function on the keys for comparison

설명

array array_intersect_ukey ( array $array1 , array $array2 [, array $... ], callable $key_compare_func )

array_intersect_ukey() returns an array containing all the values of array1 which have matching keys that are present in all the arguments.

인수

array1: Initial array for comparison of the arrays.
array2: First array to compare keys against.
...: Variable list of array arguments to compare keys against.
key_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

Returns the values of array1 whose keys exist in all the arguments.

예제

Example #1 array_intersect_ukey() example


<?php
function key_compare_func($key1, $key2)
{
    if ($key1 == $key2)
        return 0;
    else if ($key1 > $key2)
        return 1;
    else
        return -1;
}

$array1 = array('blue'  => 1, 'red'  => 2, 'green'  => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'   => 8);

var_dump(array_intersect_ukey($array1, $array2, 'key_compare_func'));
?>

위 예제의 출력:

array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}

In our example you see that only the keys 'blue' and 'green' are present in both arrays and thus returned. Also notice that the values for the keys 'blue' and 'green' differ between the two arrays. A match still occurs because only the keys are checked. The values returned are those of array1.

참고

array_diff() - 배열 차이를 계산
array_udiff() - 데이터 비교 콜백함수를 사용하여 배열간의 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_assoc() - Computes the difference of arrays with additional index check, compares data by a callback function
array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
array_diff_key() - Computes the difference of arrays using keys for comparison
array_diff_ukey() - Computes the difference of arrays using a callback function on the keys for comparison
array_intersect() - 배열의 교집합을 계산
array_intersect_assoc() - 인덱스 검사과 함께 배열의 교집합을 계산
array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
array_intersect_key() - Computes the intersection of arrays using keys for comparison

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User Contributed Notes 1 note

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gk at anuary dot com ¶

10 years ago


"array_intersect_ukey" will not work if $key_compare_func is using regular expression to perform comparison. "_array_intersect_ukey" fully implements the "array_intersect_ukey" interface and handles properly boolean comparison. However, the native implementation should be preferred for efficiency reasons.

<?php
$key_compare_func = function ($a, $b) {
    var_dump('a=' . $a. '; b=' . $b);
    
    if (strpos($b, '/') === 0) {
        return preg_match($b, $a) > 0 ? 0 : -1;
    }
    
    if ($a == $b) {
        $weight = 0;
    } else if ($a > $b) {
        $weight = 1;
    } else {
        $weight = -1;
    }
    
    var_dump('literal comparison: ' . $weight);
    
    return $weight;
};

$foo = ['aab' => '', 'bbb' => '', 'ccb' => '', 'abb' => ''];
$bar = ['/[a-z]b[a-z]/' => ''];
$buz = ['/c[a-z][a-z]/' => ''];

echo PHP_EOL . 'array_intersect_ukey' . PHP_EOL . PHP_EOL;

$subject = array_intersect_ukey ($foo, $bar, $buz, $key_compare_func);

echo PHP_EOL;

var_dump($subject);

echo PHP_EOL . '_array_intersect_ukey' . PHP_EOL . PHP_EOL;

$subject = _array_intersect_ukey($foo, $bar, $buz, $key_compare_func);

echo PHP_EOL;

var_dump($subject);

/**
 * @author Gajus Kuizinas <gk@anuary.com>
 * @version 1.0.0 (2013 09 30)
 * @url https://gist.github.com/gajus/271ad5f36337a32a184c
 */
function _array_intersect_ukey (array $arr1, array $arr2, $key_compare_func) {
    $arr_matched = [];
    $arr_unmatched = [];
    
    $args = func_get_args();
    
    $key_compare_func = end($args);
    
    foreach ($arr1 as $k1 => $v1) {
        foreach ($arr2 as $k2 => $v2) {
            $diff = $key_compare_func($k1, $k2);
        
            //var_dump('k1=' . $k1 . ', k2=' . $k2 . ', diff=' . $diff);
            
            if ($diff === 0) {
                $arr_matched[$k1] = $v1;
            } else {
                $arr_unmatched[$k1] = $v1;
            }
        }
    }
    
    if (count($args) <= 3) {
        return $arr_matched;
    }
    
    array_splice($args, 0, 2, [$arr_unmatched]);
    
    return array_merge($arr_matched, call_user_func_array('_array_intersect_ukey', $args));
}

/*
array_intersect_ukey

string(12) "a=bbb; b=aab"
string(21) "literal comparison: 1"
string(12) "a=bbb; b=ccb"
string(22) "literal comparison: -1"
string(12) "a=abb; b=bbb"
string(22) "literal comparison: -1"
string(12) "a=aab; b=abb"
string(22) "literal comparison: -1"
string(22) "a=aab; b=/[a-z]b[a-z]/"
string(22) "a=abb; b=/[a-z]b[a-z]/"
string(22) "a=abb; b=/c[a-z][a-z]/"

array(0) {
}

_array_intersect_ukey

string(22) "a=aab; b=/[a-z]b[a-z]/"
string(22) "a=bbb; b=/[a-z]b[a-z]/"
string(22) "a=ccb; b=/[a-z]b[a-z]/"
string(22) "a=abb; b=/[a-z]b[a-z]/"
string(22) "a=aab; b=/c[a-z][a-z]/"
string(22) "a=ccb; b=/c[a-z][a-z]/"

array(3) {
  ["bbb"]=>
  string(0) ""
  ["abb"]=>
  string(0) ""
  ["ccb"]=>
  string(0) ""
}*/
?>

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