array_entersect_ukey() function in PHP

array_intersect_ukey() function compares the keys of an array, checks with additional user-defined functions, and returns matching results. This function returns an array containing the entries in the first array that are present in all other arrays.

Syntax

array_intersect_ukey(arr1, arr2, arr3, arr4, …, compare_func)

Parameters

• arr1 - The array to compare. Required.

• arr2 - The array to compare. Required.

• arr3 -You can add more arrays to compare. Optional.

• arr4 - You can add more arrays to compare. Optional.

• compare_func - If the first argument is considered <，则此回调函数必须返回一个小于 0 的整数 <、= 或 > , = or > respectively instead of the second.

Return

array_intersect_ukey() function returns an array containing the entries present in the first array in all other arrays.

Example

The following is an example of comparing keys.

Real-time demonstration

<?php
function check($a,$b) {
   if ($a===$b) {
      return 0;
   }
   return ($a>$b)?1:-1;
}
$arr1 = array("a"=>"one","b"=>"two","c"=>"three");
$arr2 = array("a"=>"one","b"=>"two");
$result = array_intersect_ukey($arr1,$arr2,"check");
print_r($result);
?>

Output

Array
(
[a] => one
[b] => two
)

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