** Changed in: mahara
Status: New => In Progress
** Changed in: mahara
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1714868
Title:
mysql special characters. utf8mb4 collation
Status in Mahara:
In Progress
Bug description:
Bug reported in forum post
https://mahara.org/interaction/forum/topic.php?id=8034&offset=0&limit=10#post32267
MySQL database as we have in Mahara does not support special
characters.
In master branch and mysql DB, I added a text block to a page with text
"Some characters, like '𝑅' or emoticons '😊', produce the error."
when displaying the page I had this error:
[WAR] 72 (blocktype/lib.php:685) unserialize(): Error at offset 18 of
48 bytes
(complete error log in
http://paste.wgtn.cat-it.co.nz/15069e#JTBigIqmZagCFwOVF58qww)
in the DB block_instance table, the data it is trying to unserialize
"a:5:{s:4:"text";s:74:"<p>Some characters, like '"
looks like the it ets cut off on the special character position when is saved
in the DB
Moodle has a fix for same problem:
"UTF-8 is a character encoding that most websites use. It encodes each of the
1,112,064 valid code points. To store all of this information, four bytes is
required. The most popular values are in the three byte region. MySQL by
default only uses a three byte encoding and so values in the four byte range
(eg. Asian characters and Emojis) can not be stored.
MySQL does provide full four byte UTF-8 support, but it requires certain
database settings to be configured."
https://docs.moodle.org/31/en/MySQL_full_unicode_support#Steps_to_upgrade
https://github.com/moodle/moodle/blob/master/admin/cli/mysql_collation.php
I tried using this approach by installing Mahara with utf8mb4
create database `mahara-master` character set utf8mb4 collate
utf8mb4_unicode_ci
If we create the database with this char set, we wont be able to
install Mahara, as it only supports utf8. Even if we remove this
restriction, we will have this error:
mysqli error: [1071: Specified key was too long; max key length is
3072 bytes]
could be similar to this bug:
https://bugs.launchpad.net/mahara/+bug/547437
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