array_diff_key
(PHP 5 >= 5.1.0)
array_diff_key — Computes the difference of arrays using keys for comparison
설명
Compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.
매개변수
- array1
-
The array to compare from
- array2
-
An array to compare against
- ...
-
More arrays to compare against
반환값
Returns an array containing all the entries from array1 that are not present in any of the other arrays.
예제
Example#1 array_diff_key() example
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.
<?php
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
var_dump(array_diff_key($array1, $array2));
?>
위 예제의 출력:
array(2) { ["red"]=> int(2) ["purple"]=> int(4) }
주의
Note: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_key($array1[0], $array2[0]);.