怎么会有乱码？

本人是乱码专家
原来倒入的帖子都用html utf8 encoding 成 袈 的形式， 属于ascii, 没有乱码。 但是编辑的时候会头疼。。
新写的，
把mysql table 的语言都切换成 utf8,

ALTER TABLE `evo_antispam`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_basedomains`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_bloggroups`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_blogs`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_blogusers`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_categories`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_coll_settings`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_comments`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_files`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_filetypes`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_groups`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_hitlog`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_links`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_locales`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_pluginevents`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_plugins`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_pluginsettings`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_pluginusersettings`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_postcats`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_posts`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_poststatuses`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_posttypes`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_sessions`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_settings`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_subscriptions`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_useragents`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_users`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_usersettings`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 
     ALTER TABLE `evo_item__prerendering`  CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci ; 

然后修改 conf/_locales.php.

$force_io_charset_if_accepted = 'utf-8';
$db_config['connection_charset'] = 'utf8'; 
$default_locale = 'zh-CN-utf-8'; /*注意这个http://forums.b2evolution.net/viewtopic.php?t=13709 上没有提到，但是也是很重要的*/

这样mysql里保存的不是html utf8 encoded, 而是真是的unicode, 这样编辑不会困难。
不过似乎偶尔还会出现乱码问题，再观察观察。