array_intersect_assoc
array_intersect_uassoc
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PHP Manual

# array_intersect_key

(PHP 5 >= 5.1.0)

array_intersect_key — Computes the intersection of arrays using keys for comparison

### 설명

array array_intersect_key ( array `$array1` , array `$array2` [, array `$ ...` ] )

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

### 인수

`array1`

  The array with master keys to check.

`array2`

  An array to compare keys against.

`array`

  A variable list of arrays to compare.

### 반환값

Returns an associative array containing all the values of `array1` which have matching keys that are present in all arguments.

### 예제

Example #1 array_intersect_key() example

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

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` .

The two keys from the key => value pairs are considered equal only if (string) $key1 === (string) $key2 . In other words a strict type check is executed so the string representation must be the same.

### 참고

- array_diff() - 배열 차이를 계산
- array_udiff() - Computes the difference of arrays by using a callback function for data comparison
- 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_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison

array_intersect_assoc
array_intersect_uassoc
배열 함수 목록
PHP Manual