start-installation.md 7.9 KB
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Installing Yii
==============

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You can install Yii in two ways, using [Composer](http://getcomposer.org/) or by downloading an archive file.
The former is the preferred way, as it allows you to install new [extensions](structure-extensions.md) or update Yii by simply running a single command.

> Note: Unlike with Yii 1, standard installations of Yii 2 results in both the framework and an application skeleton being downloaded and installed.
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Installing via Composer <a name="installing-via-composer"></a>
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-----------------------

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If you do not already have Composer installed, you may do so by following the instructions at
[getcomposer.org](https://getcomposer.org/download/). On Linux and Mac OS X, you'll run the following commands:
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    curl -s http://getcomposer.org/installer | php
    mv composer.phar /usr/local/bin/composer

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On Windows, you'll download and run [Composer-Setup.exe](https://getcomposer.org/Composer-Setup.exe).
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Please refer to the [Composer Documentation](https://getcomposer.org/doc/) if you encounter any
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problems or want to learn more about Composer usage.
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With Composer installed, you can install Yii by running the following command under a Web-accessible folder:
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    composer create-project --prefer-dist yiisoft/yii2-app-basic basic
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The above command installs Yii in a directory named `basic`.
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> Tip: If you want to install the latest development version of Yii, you may use the following command,
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> which adds a [stability option](https://getcomposer.org/doc/04-schema.md#minimum-stability):
>
>     composer create-project --prefer-dist --stability=dev yiisoft/yii2-app-basic basic
>
> Note that the development version of Yii should not be used for production as it may break your running code.
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Installing from an Archive File <a name="installing-from-archive-file"></a>
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-------------------------------
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Installing Yii from an archive file involves two steps:
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1. Download the archive file from [yiiframework.com](http://www.yiiframework.com/download/yii2-basic).
2. Unpack the downloaded file to a Web-accessible folder.
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Other Installation Options <a name="other-installation-options"></a>
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--------------------------
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The above installation instructions show how to install Yii, which also creates a basic Web application that works out of the box.
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This approach is a good starting point for small projects, or for when you just start learning Yii.
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But there are other installation options available:
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* If you only want to install the core framework and would like to build an entire  application from scratch,
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  you may follow the instructions as explained in [Building Application from Scratch](tutorial-start-from-scratch.md).
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* If you want to start with a more sophisticated application, better suited to team development environments,
  you may consider installing the [Advanced Application Template](tutorial-advanced-app.md).
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Verifying the Installation <a name="verifying-installation"></a>
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--------------------------
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After installation, you can use your browser to access the installed Yii application with the following URL:
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```
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http://localhost/basic/web/index.php
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```
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This URL assumes you have installed Yii in a directory named `basic`, directly under the Web server's document root directory,
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and that the Web server is running on your local machine (`localhost`). You may need to adjust it to your installation environment.
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![Successful Installation of Yii](images/start-app-installed.png)

You should see the above "Congratulations!" page in your browser. If not, please check if your PHP installation satisfies
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Yii's requirements. You can check if the minimum requirements are met using one of the following approaches:
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* Use a browser to access the URL `http://localhost/basic/requirements.php`
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* Run the following commands:
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  ```
  cd basic
  php requirements.php
  ```
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You should configure your PHP installation so that it meets the minimum requirements of Yii. Most importantly, you should have PHP 5.4 or above. You should also install
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the [PDO PHP Extension](http://www.php.net/manual/en/pdo.installation.php) and a corresponding database driver
(such as `pdo_mysql` for MySQL databases), if your application needs a database.
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Configuring Web Servers <a name="configuring-web-servers"></a>
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-----------------------
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> Info: You may skip this subsection for now if you are just test driving Yii with no intention
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  of deploying it to a production server.

The application installed according to the above instructions should work out of box with either
an [Apache HTTP server](http://httpd.apache.org/) or an [Nginx HTTP server](http://nginx.org/), on
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 Windows, Mac OS X, or Linux.
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On a production server, you may want to configure your Web server so that the application can be accessed
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via the URL `http://www.example.com/index.php` instead of `http://www.example.com/basic/web/index.php`. Such configuration
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requires pointing the document root of your Web server to the `basic/web` folder. You may also
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want to hide `index.php` from the URL, as described in the [URL Parsing and Generation](runtime-url-handling.md) section.
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In this subsection, you'll learn how to configure your Apache or Nginx server to achieve these goals.
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> Info: By setting `basic/web` as the document root, you also prevent end users from accessing
your private application code and sensitive data files that are stored in the sibling directories
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of `basic/web`. Denying access to those other folders is a producent security improvement.
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> Info: If your application will run in a shared hosting environment where you do not have permission
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to modify its Web server configuration, you may still adjust the structure of your application for better security. Please refer to
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the [Shared Hosting Environment](tutorial-shared-hosting.md) section for more details.


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### Recommended Apache Configuration <a name="recommended-apache-configuration"></a>
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Use the following configuration in Apache's `httpd.conf` file or within a virtual host configuration. Note that you
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should replace `path/to/basic/web` with the actual path for `basic/web`.
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```
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# Set document root to be "basic/web"
DocumentRoot "path/to/basic/web"

<Directory "path/to/basic/web">
    RewriteEngine on

    # If a directory or a file exists, use the request directly
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    # Otherwise forward the request to index.php
    RewriteRule . index.php

    # ...other settings...
</Directory>
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```

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### Recommended Nginx Configuration <a name="recommended-nginx-configuration"></a>
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You should have installed PHP as an [FPM SAPI](http://php.net/install.fpm) to use [Nginx](http://wiki.nginx.org/).
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Use the following Nginx configuration, replacing `path/to/basic/web` with the actual path for `basic/web` and `mysite.local` with
the actual hostname to serve.
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```
server {
    charset utf-8;
    client_max_body_size 128M;

    listen 80; ## listen for ipv4
    #listen [::]:80 default_server ipv6only=on; ## listen for ipv6

    server_name mysite.local;
    root        /path/to/basic/web;
    index       index.php;

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    access_log  /path/to/basic/log/access.log main;
    error_log   /path/to/basic/log/error.log;
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    location / {
        # Redirect everything that isn't a real file to index.php
        try_files $uri $uri/ /index.php?$args;
    }

    # uncomment to avoid processing of calls to non-existing static files by Yii
    #location ~ \.(js|css|png|jpg|gif|swf|ico|pdf|mov|fla|zip|rar)$ {
    #    try_files $uri =404;
    #}
    #error_page 404 /404.html;

    location ~ \.php$ {
        include fastcgi.conf;
        fastcgi_pass   127.0.0.1:9000;
        #fastcgi_pass unix:/var/run/php5-fpm.sock;
    }

    location ~ /\.(ht|svn|git) {
        deny all;
    }
}
```

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When using this configuration, you should also set `cgi.fix_pathinfo=0` in the `php.ini` file
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in order to avoid many unnecessary system `stat()` calls.

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Also note that when running an HTTPS server, you need to add `fastcgi_param HTTPS on;` so that Yii
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can properly detect if a connection is secure.