Bug #79238 [Opn->Nab]: preg_split returns weird results

Edit report at https://bugs.php.net/bug.php?id=79238&edit=1 ID: 79238 Updated by: requinix@php.net Reported by: vuongvankhanh89 at gmail dot com Summary: preg_split returns weird results -Status: Open +Status: Not a bug Type: Bug Package: PCRE related Operating System: Ubuntu 18.04 PHP Version: 7.4.2 Block user comment: N Private report: N New Comment: You must use UTF-8 mode when working with UTF-8 patterns or inputs. https://3v4l.org/lI7FX Previous Comments: ------------------------------------------------------------------------ [2020-02-07 07:50:26] vuongvankhanh89 at gmail dot com Description: ------------ Hi, today i created a pattern to separate text to an array. Regex string is very simple: preg_split('/\R| /m', '翶耆倈者耈翶耆倈傀堀X蔀耖耄') it detects whitespace and linebreak as the separators and then converts string to array of strings. in the exam above there is no whitespace or linebreak but result i got is an array with 2 elements. array(2) { [0]=> string(11) "翶耆倈�" [1]=> string(28) "耈翶耆倈傀堀X蔀耖耄" } 者 has been turned to a separator, it also becomes a weird charactor. Kindly help! Thanks in advance. Test script: --------------- var_dump(preg_split('/\R| /m', '翶耆倈者耈翶耆倈傀堀X蔀耖耄')); Expected result: ---------------- array(1) { [0]=> string(39) "翶耆倈者耈翶耆倈傀堀X蔀耖耄" } Actual result: -------------- array(2) { [0]=> string(11) "翶耆倈�" [1]=> string(28) "耈翶耆倈傀堀X蔀耖耄" } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79238&edit=1