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Table of Contents
It Keeps Sensitive Files Out of Public Reach
It Organizes Static Assets Properly
It Handles Application Bootstrapping
Home PHP Framework YII What is the purpose of the web directory in Yii?

What is the purpose of the web directory in Yii?

Jul 28, 2025 am 02:28 AM
yii Web目錄

The web directory in Yii serves as the public entry point for user requests, enhancing security and organization. It contains the index.php file and all static assets like CSS, JS, and images, ensuring that sensitive application files such as configs and models remain outside of public access. 1. It improves security by preventing direct URL access to critical directories. 2. It organizes static assets in a centralized location for easy management and loading. 3. It handles application bootstrapping through index.php, which sets environment constants, loads dependencies, and runs the app efficiently. This structure keeps deployments clean and supports scalable, secure Yii applications.

What is the purpose of the web directory in Yii?

In Yii, a web directory (often referred to as the "web root" or "public directory") plays a key role in how the application is structured and accessed by users. Its main purpose is to serve as the entry point for all user requests — this means it's where your index.php file lives, along with assets like CSS, JS, images, and other publicly accessible files.

This setup helps separate public-facing content from the rest of your application code, improving security and keeping things organized.

It Keeps Sensitive Files Out of Public Reach

One big reason the web directory exists is security. In most Yii applications, the folder structure looks something like this:

  • /web (this is the web directory)
  • /config
  • /controllers
  • /models
  • /views

By setting up your server to point to the /web folder as the document root, you ensure that all other directories (like config and models) are not directly accessible via a URL. This way, sensitive files — such as database configuration or core logic — can't be downloaded or viewed by someone typing in a URL.

If everything were in a single public folder, it would be easier to accidentally expose files you didn’t mean to. The web directory lets you avoid that risk.

It Organizes Static Assets Properly

The web directory is also where all your static assets go — things like JavaScript files, CSS stylesheets, images, and fonts. These are the files that browsers need direct access to in order to render your site properly.

For example:

  • /web/css/site.css
  • /web/js/app.js
  • /web/images/logo.png

You can link to these files directly from your views using relative paths or Yii’s built-in asset handling tools like yii\web\AssetBundle. Keeping them in one place makes it easier to manage what gets exposed and how it's loaded in the browser.

It Handles Application Bootstrapping

Inside the web directory, the index.php file is the starting point for every request. It does a few important things:

  • Sets up environment constants
  • Includes the Composer autoload file
  • Loads the Yii framework
  • Runs the application

This file is minimal on purpose — it ensures that the app boots quickly and securely. If you ever deploy a Yii app to a live server, you’ll typically only upload the contents of the /web folder (plus necessary parent directories if configured differently), making deployment cleaner and more focused.


That’s basically the role the web directory plays in Yii — it keeps things secure, organized, and efficient. It might seem like just another folder at first, but it’s actually one of the key pieces that help Yii apps run safely and scale well.

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