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Bug #78164 array_diff_key won't return diff while it shoud in a very specific case
Submitted: 2019-06-14 15:56 UTC Modified: 2019-06-14 16:04 UTC
From: joseph42379 at gmail dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 7.1Git-2019-06-14 (snap) OS: Mac OS
Private report: No CVE-ID: None
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 [2019-06-14 15:56 UTC] joseph42379 at gmail dot com 
Description:
------------
Turns out if the first argument(array) provided is smaller than the second one, it always return the empty array.

Test script:
---------------
<?
var_dump(
        array_diff_key(
            [
                'a'=>1,
            ], 
            [
                'a'=>1,
                'b'=>1
            ]
        )
    );

Expected result:
----------------
array(0) { ["b"]=> int(1) }

Actual result:
--------------
array(0) { }

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 [2019-06-14 16:04 UTC] requinix@php.net
-Status: Open +Status: Not a bug -Package: Unknown/Other Function +Package: *General Issues
 [2019-06-14 16:04 UTC] requinix@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

https://www.php.net/manual/en/function.array-diff-key.php
> 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.

> Returns an array containing all the entries from array1 whose keys are absent from all of the other arrays.
 
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