What are the system requirements for running Yii?
Jul 29, 2025 am 04:13 AMTo run Yii smoothly, ensure PHP 5.4 (preferably 7.x or 8.x) with extensions mbstring, openssl, tokenizer, xml enabled; configure Apache or Nginx correctly—Apache needs mod_rewrite and .htaccess support, Nginx requires rewrite rules pointing to the web/ folder; use a supported database like MySQL, PostgreSQL, SQLite, MSSQL, or Oracle with proper PDO drivers; set server root to the web directory, not project root; enable InnoDB and utf8mb4 encoding for MySQL; optionally use Composer, Git, IDEs, or local dev tools like XAMPP for easier development.
Yii can run on various systems, but to get it working smoothly, you should meet a few basic requirements. The exact specs depend on your project size and traffic, but here’s what you generally need.
PHP Version
Yii 2 requires PHP 5.4 or higher, though using PHP 7.x or 8.x is strongly recommended for better performance and security. You’ll also want common extensions like mbstring
, openssl
, tokenizer
, and xml
enabled since Yii relies on them for core functions.
If you're setting this up locally or on a server:
- Check the
php.ini
file - Make sure required extensions are un-commented (no
;
beforeextension=...
) - Restart Apache or Nginx after changes
Web Server Options
You can use Apache, Nginx, or even Windows IIS with Yii, but most people go with Apache or Nginx because they’re more widely supported.
For Apache:
- Enable
mod_rewrite
so pretty URLs work - Use
.htaccess
files for URL rewriting
For Nginx:
- Set up rewrite rules in the server block config
- Point the root to the
web/
folder of your Yii app
A common mistake is pointing the server root to the project root instead of the web
directory — that could expose sensitive files.
Database Support
Yii supports multiple databases out of the box:
- MySQL (most common)
- PostgreSQL
- SQLite
- MSSQL
- Oracle (with PDO drivers)
You don’t need all of these — just install the one you plan to use. For example, if you're using MySQL, make sure pdo_mysql
is enabled in your PHP config.
Also, keep in mind:
- Use InnoDB for Yii's default migration setup
- Set proper character encoding (
utf8mb4
is best for full emoji support)
Optional But Helpful Tools
While not strictly required, some tools make development easier:
- Composer (for dependency management)
- Git (for version control)
- A decent IDE or code editor
- Local dev environments like XAMPP, WAMP, or Docker setups
Composer is especially important since Yii uses it for installing packages and managing assets.
That’s the main setup picture. It’s not super strict, but getting these parts right makes a big difference when starting a Yii project.
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