Bug #71971 [Opn->Nab]: mb_substr maybe returns false depending on mbstring.func_overload

Edit report at https://bugs.php.net/bug.php?id=71971&edit=1 ID: 71971 Updated by: ab@php.net Reported by: taylor at defuse dot ca Summary: mb_substr maybe returns false depending on mbstring.func_overload -Status: Open +Status: Not a bug Type: Bug Package: mbstring related Operating System: Arch Linux PHP Version: 7.0.5 Block user comment: N Private report: N New Comment: Thanks for the report. This actually is the same as bug #55241, and you can walk further to bug #28899 to see that this is intended behavior. The pure mb_* functions may have different behavior, but once they do overload, the behavior should be the same as in the corresponding core functions. Thanks. Previous Comments: ------------------------------------------------------------------------ [2016-04-06 01:48:28] taylor at defuse dot ca Description: ------------ When mbstring.func_overload=0, mb_substr returns "" when you call it with an out of bounds range. This is consistent with the documentation. However, when mbstring.func_overload=7, mb_substr returns boolean false. This is inconsistent with the documentation. I expect the behavior to be consistent regardless of the value of mbstring.func_overload. This is different from Bug #55241. Test script: --------------- <?php $result = mb_substr('abc', 5, 2); var_dump($result); Expected result: ---------------- When mbstring.func_overload=0: string(0) "" When mbstring.func_overload=7: string(0) "" Actual result: -------------- When mbstring.func_overload=0: string(0) "" When mbstring.func_overload=7: bool(false) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71971&edit=1