Why does your site get messed up when you turn on SEF (Search Engine Friendly URLs)?

出典: Joomla! ドキュメンテーション

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Usually this has something to do with your host's settings. One solution that commonly works is to enter a value for the $live_site variable in the configuration.php file found in the root directory of your Joomla site files. The value of the variable must be manually edited.

Typically, it would look like:

var $live_site = 'http://example.com';

But if you access your website in a folder, it would be like this:

var $live_site = 'http://example.com/joomla';

Unfortunately, this does not always work correctly. Setting it to just your folder may help:

var $live_site = '/joomla';

Sometimes the value (especially when determined by automatic installers other than that of Joomla!) can be present, but simply wrong. To enable the automatic base finding algorithm, empty it completely:

var $live_site = '';

• See Joomla! v 1.5 SEF URLs Scribd by Benjamin Hättasch which contains step-by-step instructions for installing and trouble-shooting your SEF URLs.