CI 3.0 default route is placed in a subfolder and is inaccessible.

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##For example, if you want to configure the default route as: $route['default_controller'] = 'index/home';

Before ci3.0, it could be placed in a subfolder in controllers in, but when it comes to ci3.0, it must be placed directly under controllers. If you insist on placing it under its subfolder, the solution is as follows:

Find system > core > router.PHP 2978 Comment out line -301. (Mine is version 3.1.3) as follows:

1. // if (sscanf($this->default_controller, '%[^/]/%s', $class, $method) !== 2)

2. // {

##                                                                              #// }

4. Then add the following code at the end:

$index =

strripos(

$this->default_controller,

'/');

// Record the subscript of the symbol '/'

1. ($index == false) ##                                                                       $this->default_controller;

   // Without '/' you can assign the value directly

2. # }else{

3.               
$this->directory =
4. substr(

   $this->default_controller, 0, $index + 1); //Directory string

5. #                                                       ->default_controller, $index + 1); //Class string

6. ## }   ##                                                                                         ​ 

7. #This solves the problem that the default route cannot be found in a subfolder.

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