note 129782 added to function.array-diff

The description is kinda ambiguous at first glance, one might think that the array_diff function returns the differences across *all* given arrays (which is what I was actually looking for, and that's why I was surprised that, in the example code, the result did not include "yellow"). However, i wrote a neat oneliner to compute the differences across all given arrays: <?php # Returns an array with values that are unique across all of the given arrays function array_unique_values(...$arrays) { return array_keys(array_filter(array_count_values(array_merge(...$arrays)), fn($count) => $count === 1)); } # Example: $array1 = ['a', 'b', 'c', 'd']; $array2 = ['a', 'b', 'x', 'y']; $array3 = ['a', '1', 'y', 'z']; print_r(array_unique_values($array1, $array2, $array3)); ?> Result: Array ( [0] => c [1] => d [2] => x [3] => 1 [4] => z ) ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.137 (proxied: 2003:c2:3f13:5400:9d59:9998:e5a6:8470) ---- Manual Page -- https://php.net/manual/en/function.array-diff.php Edit -- https://main.php.net/note/edit/129782 Del: integrated -- https://main.php.net/note/delete/129782/integrated Del: useless -- https://main.php.net/note/delete/129782/useless Del: bad code -- https://main.php.net/note/delete/129782/bad+code Del: spam -- https://main.php.net/note/delete/129782/spam Del: non-english -- https://main.php.net/note/delete/129782/non-english Del: in docs -- https://main.php.net/note/delete/129782/in+docs Del: other reasons-- https://main.php.net/note/delete/129782 Reject -- https://main.php.net/note/reject/129782 Search -- https://main.php.net/manage/user-notes.php