手册:$wgDBmysql5

MySQL相关: $wgDBmysql5
Set to true to set MySQL connection into UTF-8 encoding (experimental)
引进版本：	1.5.1 (r11508)
弃用版本：	1.31.0 (Gerrit change 437312; git #7271d50b)
移除版本：	1.33.0 (Gerrit change 498644; git #26118ad0)
允许的值：	（布尔值）
默认值：	false
其他设置： 按首字母排序 | 按功能排序

详情

Note beforehand: No matter what you set here, MediaWiki internally always uses UTF-8 encoding. Everything MediaWiki sends to the database is always in UTF-8 encoding.

Set to true to send 'SET NAMES=utf8;' on connect. If set to false, 'SET NAMES binary;' will be used, which is the default and so recommended. Generally you should not change this value once installed -- if you created the wiki in Binary or UTF-8 schemas, you should keep this off. The feature is experimental and with your settings the data is sent (and so also finally saved) with the right encoding anyway.

When your database columns do not use UTF-8 or binary encoding, but e.g. latin1, then setting $wgDBmysql5 to true is important. 原因： MediaWiki内部总是使用UTF-8编码。 任何MediaWiki发送到数据库的数据也总是UTF-8编码。 如果您的数据库不使用UTF-8或二进制，而是其他编码（例如latin1），那么来自MediaWiki的UTF-8内容将被写入自latin1列中。 When in that case you set $wgDBmysql5 to true, MySQL will convert the UTF-8 data coming from MediaWiki and will store it in the encoding, which is correct for the database columns. But if in that case you set $wgDBmysql5 to false, MySQL will see all data coming from MediaWiki as binary (thus not having any encoding) and will write it into the database columns without charset conversion. So then you would end up with UTF-8 content in latin1 columns and that is what you do not want!

(See also $wgDBTableOptions which in recentish versions will include the table type and character set used when creating tables.)

May break if you're upgrading an existing wiki and then change this setting. Symptoms of brokenness are likely to include incorrect behavior with page titles, usernames, comments etc containing non-ASCII characters. Might also cause failures on the object cache and other things.

If you are still using MySQL 4, your wiki was created with the old "MySQL 4 backwards-compatible UTF-8" schema and $wgDBmysql5 should stay off; your MySQL version does not support it anyway.