Bug #65090 [Opn->Nab]: array_multisort() with SORT_NATURAL | SORT_FLAG_CASE results in incorrect order

Edit report at https://bugs.php.net/bug.php?id=65090&edit=1 ID: 65090 Updated by: ab@php.net Reported by: rgrove at smugmug dot com Summary: array_multisort() with SORT_NATURAL | SORT_FLAG_CASE results in incorrect order -Status: Open +Status: Not a bug Type: Bug Package: Arrays related Operating System: Linux 2.6.18-194.3.1.el5 PHP Version: 5.4.16 Block user comment: N Private report: N New Comment: 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 That flag combination is exactly what natcasesort() is supposed to do. That means the behavior is totally correct. Unless you don't need case folding, just remove SORT_FLAG_CASE. Previous Comments: ------------------------------------------------------------------------ [2013-06-21 18:50:52] rgrove at smugmug dot com Description: ------------ When the SORT_NATURAL | SORT_FLAG_CASE flags are passed to array_multisort(), it sorts strings beginning with the letter "a" above strings beginning with "_", even though "_" has a lower ordinal value. natsort() places "_" before "a" as I would expect, and array_multisort() places "_" before "a" when given only the SORT_NATURAL flag, without ORing it with SORT_FLAG_CASE. See the test script for details. Test script: --------------- <?php $keys = ["_", "a"]; $values = ["first", "second"]; // Results in incorrect order. array_multisort($keys, SORT_NATURAL | SORT_FLAG_CASE, $values, SORT_ASC); print_r($keys); print_r($values); // Results in correct order. natsort($keys); print_r($keys); // Results in correct order. array_multisort($keys, SORT_NATURAL, $values, SORT_ASC); print_r($keys); ?> Expected result: ---------------- I expect "_" to be sorted before "a", just as natsort() does. Actual result: -------------- "a" is sorted before "_". ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=65090&edit=1