


How do I create a new Yii application? (composer create-project yiisoft/yii2-app-basic basic or yii web/index.php)
Jun 28, 2025 am 12:15 AMTo create a new Yii application, you must first confirm the environment, use Composer to create a project and run it test. First, make sure to install PHP (7.4), Composer and database; secondly, create a project by using the command composer create-project yiisoft/yii2-app-basic basic; then execute php yii serve to start the built-in server to access http://localhost:8080 test application; common problems include insufficient permissions and need to be empowered runtime and web/assets, URL rewrite requires configuration of mod_rewrite, and database connection requires checking config/db.php; during deployment, web/ should be set as the website root directory, modify cookieValidationKey, and turn off debugging mode. Follow these steps to successfully build Yii application.
Creating a new Yii application is not difficult. The key is to understand the process and several details that need to be paid attention to.
First, you have to make sure that your environment is ready. PHP and Composer are required, and the PHP version is best to be 7.4 or above. Yii2 has strict requirements on this. Of course, MySQL or other databases must be installed, but you don’t have to rush to configure the database when initializing the project.
Create a project using Composer
The most common method is to create basic projects through Composer. The command is as follows:
composer create-project yiisoft/yii2-app-basic basic
This command will create a directory called basic
and install the basic template of Yii2. You can change basic
to your favorite name, such as myproject
.
After execution, you have a complete Yii2 infrastructure, including core folders such as controllers, views, and models. This step is actually quite fast unless your network is not good or the mirror is not set up properly.
Suggestions: If you are in the country, you can use Alibaba Cloud's Composer image to speed up downloads:
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
Start the built-in server test run
After the project is created, you can quickly verify whether it can run normally. Go to the project directory and execute:
php yii serve
This command will start a built-in PHP web server and listen to http://localhost:8080
by default. Open the browser to access this address. If you see the "Congratulations!" page, it means that your Yii application has already started running.
Note: Some students may directly access
web/index.php
, but by default, Apache or Nginx can correctly resolve this path. If you use a built-in server, you can just access the root path.
Possible problems and solutions
- Permissions issue : Sometimes you will find that you cannot write to
runtime
orweb/assets
directory. At this time, you need to add writable permissions to these directories. - URL rewrite problem : If you configure Nginx or Apache yourself, remember to enable URL rewrite (mod_rewrite), otherwise the page will report 404.
- Database connection failed : Although the newly created project does not need to connect to the database immediately, if you have enabled Gii or have an error while trying to access the database function, please check the database configuration in
config/db.php
.
Tips for simple deployment and online
If you want to deploy this application to a production environment, there are a few things to note:
Point the website root directory to
web/
folder, and do not expose other sensitive filesModify
'cookieValidationKey'
inconfig/web.php
to ensure securityTurn on debugging mode only in the development environment, set to false before going online:
'debug' => YII_DEBUG,
Basically that's it. The whole process is not complicated, but there are several easy things to ignore, such as permissions, rewriting rules and database configuration. You can run smoothly with a little attention.
The above is the detailed content of How do I create a new Yii application? (composer create-project yiisoft/yii2-app-basic basic or yii web/index.php). For more information, please follow other related articles on the PHP Chinese website!

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