utf8mb4

This is probably something simple. I swear I've been looking online for the answer and haven't found it. Since my particular case is a little atypical I finally decided to ask here. I have a few tables in MySQL that I'm using for a Chinese language program. It needs to be able to support every possible Chinese character, including rare ones that don't have great font support. A sample cell in the table might be this: 東菄鶇䍶𠍀倲𩜍𢘐涷蝀凍鯟𢔅崠埬𧓕䰤 In order to get that to work right in the database, I've had to set the encoding/collation to utf8mb4. So far so good. Unfortunately when I pull the same string

Im trying to convert my UTF8 MySQL 5.5.30 database to UTF8MB4. I have looked at this article https://mathiasbynens.be/notes/mysql-utf8mb4 but have some questions. I have done these ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci; ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci; The last one was manually done with 62 tables, one of them gave me this warning 13:08:30 ALTER TABLE bradspelold.games CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci 101289 row(s) affected, 2 warning(s): 1071 Specified key was too long;

Please help me understand how multibyte characters like emoji's are handled in MySQL utf8mb4 fields. See below for a simple test SQL to illustrate the challenges. /* Clear Previous Test */ DROP TABLE IF EXISTS `emoji_test`; DROP TABLE IF EXISTS `emoji_test_with_unique_key`; /* Build Schema */ CREATE TABLE `emoji_test` ( `id` int(11) NOT NULL AUTO_INCREMENT, `string` varchar(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `status` tinyint(1) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; CREATE TABLE `emoji_test_with_unique_key` (

I am using a utf8 charset mysql tables in a mysql 5.1 server, which does not support utf8mb4 encoding in tables. When inserting 4-byte encoded utf8 characters like "𡃁","𨋢","𠵱","𥄫","𠽌","唧","𠱁" . The table will popup error or skip the following texts. How can I programmatically detect 4-byte encoded utf8 characters in PHP and replace them? The following regular expression will replace 4-byte UTF-8 characters: function replace4byte($string, $replacement = '') { return preg_replace('%(?: \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3 | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15 | \xF4[\x80-\x8F][\x80-

utf16 or utf32? I'm trying to store content in a lot of languages. Some of the languages use double-wide fonts (for example, Japanese fonts are frequently twice as wide as English fonts). I'm not sure which kind of database I should be using. Any information about the differences between these four charsets... Ignacio Vazquez-Abrams MySQL's utf32 and utf8mb4 (as well as standard UTF-8) can directly store any character specified by Unicode; the former is fixed size at 4 bytes per character whereas the latter is between 1 and 4 bytes per character. utf8mb3 and the original utf8 can only store

In a table x , there is a column with the values u and ü . SELECT * FROM x WHERE column='u' . This returns u AND ü , although I am only looking for the u . The table's collation is utf8mb4_unicode_ci . Wherever I read about similar problems, everyone suggests to use this collation because they say that utf8mb4 really covers ALL CHARACTERS. With this collation, all character set and collation problems should be solved. I can insert ü , è , é , à , Chinese characters , etc. When I make a SELECT * , they are also retrieved and displayed correctly. The problem only occurs when I COMPARE two