note 125390 added to migration74.incompatible

Hello. I faced a strange issue after upgrade our system to 7.4. In our codebase we use strptime to get the release mont to our products. In this way: $month = strptime($month, '%B')['tm_mon'] + 1; So we use '%B' -> full month name In PHP 7.2 everything works fine, but in 7.4 it returns with FALSE. I put a simple test into our system with some hardcoded data: (it is in the route.php so the test is pure php, laravel does not affect it) Route::get('test', function () { dump(strptime('Tháng 9', '%B')); dump(strptime('Tháng Chín', '%B')); }); The result in 7.2: false array:9 [▼ "tm_sec" => 0 "tm_min" => 0 "tm_hour" => 0 "tm_mday" => 0 "tm_mon" => 8 "tm_year" => 0 "tm_wday" => 5 "tm_yday" => 242 "unparsed" => "" ] So it seems OK, because 'Tháng 9' is the sort name. BUT in 7.4 array:9 [▼ "tm_sec" => 0 "tm_min" => 0 "tm_hour" => 0 "tm_mday" => 0 "tm_mon" => 8 "tm_year" => 0 "tm_wday" => 5 "tm_yday" => 242 "unparsed" => "" ] false The sort name returns with data even though I use '%B' and the long name return with false! I could not find any documentation about this change. ---- Server IP: 45.112.84.4 Probable Submitter: 185.85.3.172 (proxied: 121.121.224.97) ---- Manual Page -- http://php.net/manual/en/migration74.incompatible.php Edit -- https://master.php.net/note/edit/125390 Del: integrated -- https://master.php.net/note/delete/125390/integrated Del: useless -- https://master.php.net/note/delete/125390/useless Del: bad code -- https://master.php.net/note/delete/125390/bad+code Del: spam -- https://master.php.net/note/delete/125390/spam Del: non-english -- https://master.php.net/note/delete/125390/non-english Del: in docs -- https://master.php.net/note/delete/125390/in+docs Del: other reasons-- https://master.php.net/note/delete/125390 Reject -- https://master.php.net/note/reject/125390 Search -- https://master.php.net/manage/user-notes.php