To enable debugging mode in Yii, install and configure the yii2-debug module. 1. Check if yii2-debug is installed via Composer using composer require --dev yiisoft/yii2-debug. 2. In config/web.php, add the debug module to bootstrap and modules under YII_ENV_DEV. 3. Confirm YII_ENV is defined as 'dev' in index.php. 4. After setup, view the debug toolbar in the browser for detailed request, query, log, and environment data.
To enable debugging mode in Yii, you need to configure the application to display detailed error messages and load the debug module. This is especially useful during development for tracking down issues quickly.
Check if Yii Debug Module is Installed
Yii provides a built-in debug extension called yiisoft/yii2-debug. First, make sure this package is installed in your project:
- If you're using Composer, run:
composer require --dev yiisoft/yii2-debug
Once installed, it should appear under the "require-dev" section in your composer.json.
Configure the Application
Next, you need to enable the debug module in your application config file (usually found at config/web.php for web apps):
Add the following configuration snippet inside the main array:
if (YII_ENV_DEV) {
// Configuration for 'debug' module
$config['bootstrap'][] = 'debug';
$config['modules']['debug'] = [
'class' => 'yii\debug\Module',
// Optional: restrict access to certain IPs
// 'allowedIPs' => ['127.0.0.1', '::1'],
];
}This ensures that the debug module only loads in development environments (YII_ENV_DEV), which keeps things secure in production.
Make Sure YII_ENV Is Set Correctly
Check that your entry script (index.php) defines YII_ENV as 'dev' during development:
defined('YII_ENV') or define('YII_ENV', 'dev');If it's set to 'prod' or not defined properly, the debug module won't load even if configured.
View Debug Toolbar
Once everything is set up and you're viewing your site in the browser (in dev mode), you should see a small debug toolbar on the bottom right corner of the page. Clicking it will show tabs like:
- Request details
- Database queries
- Logs
- Profiling info
- Environment variables
It’s a powerful tool to inspect what's going on behind the scenes without manually adding logs or var dumps everywhere.
That’s basically how you turn on debugging in Yii. It’s straightforward once you know where to look — just install the module, configure it conditionally, and ensure your environment is set correctly.
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