根据 CodeIgniter - .htaccess 给出 404 未找到页面（文件位于子文件夹中）的问题，我们将介绍如何通过.htaccess文件配置来处理这个问题。在CodeIgniter框架中，通过.htaccess文件可以实现URL重写和错误处理等功能。

RewriteEngine On
RewriteBase /your_project_folder/
# 如果请求的文件或目录存在，则直接访问
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^(.*)$ - [L]
# 否则，将请求重写到index.php
RewriteRule ^(.*)$ index.php/$1 [L]

php
    
    
404 页面未找到
    
很抱歉，您请求的页面不存在。

php
/*
|--------------------------------------------------------------------------
| Error Logging Threshold
|--------------------------------------------------------------------------
|
| If you have enabled error logging, you can set an error threshold to
| determine what gets logged. Threshold options are:
| 
|     0 = Disables logging, Error logging TURNED OFF
|     1 = Error Messages (including PHP errors)
|     2 = Debug Messages
|     3 = Informational Messages
|     4 = All Messages
|
| For a live site you'll usually only enable Errors (1) to be logged otherwise
| your log files will fill up very fast.
|
*/
$config['log_threshold'] = 0;

RewriteEngine On
RewriteBase /your_project_folder/
# 如果请求的文件或目录存在，则直接访问
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^(.*)$ - [L]
# 否则，将请求重写到index.php
RewriteRule ^(.*)$ index.php/$1 [L]

php
    
    
404 页面未找到
    
很抱歉，您请求的页面不存在。

php
$config['log_threshold'] = 0;