Bug #81584 [Asn->Ana]: mb_strwidth() returns incorrect value

Edit report at https://bugs.php.net/bug.php?id=81584&edit=1 ID: 81584 Updated by: alexdowad@php.net Reported by: azjezz at protonmail dot com Summary: mb_strwidth() returns incorrect value -Status: Assigned +Status: Analyzed Type: Bug Package: mbstring related Operating System: N/A PHP Version: 8.1.0RC5 Assigned To: alexdowad Block user comment: N Private report: N New Comment: Azjezz, thanks for the report! First of all, the Unicode Consortium maintains the standard on which Unicode characters are considered 'halfwidth' and which are 'fullwidth'. See: http://www.unicode.org/reports/tr11/ If you download all the data tables for the Unicode standard from unicode.org, you can see the raw data on character width in the file EastAsianWidth.txt. In the first example you kindly provided, the coffee cup emoji are U+2615. The latest version of the Unicode standard indicates these are 'fullwidth' characters. Plus 2 for the spaces, the output of 8 is therefore correct. Likewise, the gold, silver, and bronze medal emoji are all fullwidth. So 6 is the correct output. And as for the horoscope symbols... yep, they are also fullwidth. In summary, the latest version of PHP complies with the latest Unicode standard, and the previous version of PHP did not. Now, I would like to find out... is this causing a problem for you? Is there some reason why you preferred the old Unicode standard to the new one? Looking forward to your feedback. Previous Comments: ------------------------------------------------------------------------ [2021-11-01 17:44:12] nikic@php.net Possibly due to https://github.com/php/php-src/commit/d8c785b894e1a4ed9793d71cad02330cb0034faa? ------------------------------------------------------------------------ [2021-11-01 17:19:24] azjezz at protonmail dot com test script: https://3v4l.org/X6DWb ------------------------------------------------------------------------ [2021-11-01 17:17:33] azjezz at protonmail dot com Description: ------------ The "width" or a string containing emojis has changed between PHP <= 8.0 and 8.1. Test script: --------------- var_dump( mb_strwidth('☕ ☕ ☕'), mb_strwidth('????????????'), mb_strwidth('♈♉♊♋♌♍♎♏♐♑♒♓'), ); Expected result: ---------------- int(5) int(3) int(12) Actual result: -------------- int(8) int(6) int(24) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81584&edit=1