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Showing content from https://www.php.net/manual/en/function.array-diff-ukey.php below:

PHP: array_diff_ukey - Manual

array_diff_ukey

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison

Description

Unlike array_diff_key() a user supplied callback function is used for the indices comparison, not internal function.

Parameters

array

The array to compare from

arrays

Arrays to compare against

key_compare_func

The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

Caution

Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

Return Values

Returns an array containing all the entries from array that are not present in any of the other arrays.

Examples

Example #1 array_diff_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);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);var_dump(array_diff_ukey($array1, $array2, 'key_compare_func'));
?>

The above example will output:

array(2) {
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}

Notes

Note:

This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_ukey($array1[0], $array2[0], 'callback_func');.