Yii2 Pretty URL / SEO Friendly URL – Advanced Template

By Default YII Advanced URL structures for frontend and backend are:

yii/frontend/web/index.php?r=controller/action
yii/backend/web/index.php?r=controller/action
To make URL user and SEO friendly we would like to change the frontend URL to:
yii/controller/action
And backend URL to:
Yii/admin/controller/action
For this we need to make the following changes:
A. Add this in frontend/config/main.php and backend/config/main.php in components array:

'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'enableStrictParsing' => false,
            'rules' => [
                // ...
            ],
        ],

B. Copy all data from frontend/web folder to application root folder(yii) and from backend/web folder to yii/admin folder.

So folder structure will be like this:

- yii/
    - frontend/
    - backend/
    - common/
    - .. other folders..
    - admin/
        - assets/
        - css/
        - index.php
    - assets/
    - css/
    - index.php

C. Create file .htaccess on yii and yii/admin folders and write below code in both:
RewriteEngine on

# if a directory or a file exists, use it directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# otherwise forward it to index.php
RewriteRule . index.php

D. Replace Yii/index.php code with following:

defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/vendor/autoload.php');
require(__DIR__ . '/vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/common/config/bootstrap.php');
require(__DIR__ . '/frontend/config/bootstrap.php');

$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/common/config/main.php'),
    require(__DIR__ . '/common/config/main-local.php'),
    require(__DIR__ . '/frontend/config/main.php'),
    require(__DIR__ . '/frontend/config/main-local.php')
);

$application = new yii\web\Application($config);
$application->run();

E. Replace Yii/admin/index.php code with following:

defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/vendor/autoload.php');
require(__DIR__ . '/vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/common/config/bootstrap.php');
require(__DIR__ . '/frontend/config/bootstrap.php');

$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/common/config/main.php'),
    require(__DIR__ . '/common/config/main-local.php'),
    require(__DIR__ . '/frontend/config/main.php'),
    require(__DIR__ . '/frontend/config/main-local.php')
);

$application = new yii\web\Application($config);
$application->run();

Now you can access frontend by url: yii/controller/action
And backend by url: yii/admin/controller/action