Bug #81692 [Ver]: array_unique bug

Edit report at https://bugs.php.net/bug.php?id=81692&edit=1 ID: 81692 Updated by: requinix@php.net Reported by: stanislav dot eismont at gmail dot com Summary: array_unique bug Status: Verified Type: Bug Package: Arrays related Operating System: ubuntu 20.04 PHP Version: 7.4.26 Assigned To: cmb Block user comment: N Private report: N New Comment: Isn't this just a result of inconsistent comparisons during sorting? The sorted arrays don't place the two reds next to each other with SORT_REGULAR; they do if you use SORT_STRING, which also produces the expected unique array. https://3v4l.org/JTQMr https://3v4l.org/gPaPn Previous Comments: ------------------------------------------------------------------------ [2021-12-03 12:25:04] cmb@php.net Indeed, broken as of PHP 7.0.0: <https://3v4l.org/PXQZe>. ------------------------------------------------------------------------ [2021-12-03 11:30:02] stanislav dot eismont at gmail dot com Description: ------------ array_unique returns incorrect result with SORT_REGULAR flag. Test script: --------------- <?php $array = ["red", "color" => "red", 78, 78, 12, "12", false, null, false, 0, true, 1, 0, null, 2.12, "2.12", 8, "-s"]; var_dump(array_unique($array, SORT_REGULAR)); Expected result: ---------------- Expected one "red" value printed: array(11) { [0]=> string(3) "red" // ... } Actual result: -------------- Actually "red" printed twice: array(11) { [0]=> string(3) "red" ["color"]=> string(3) "red" // ... } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81692&edit=1