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Technical Articles

PHP Framework

YII

How to write unit tests for a Yii application?

Answer: When writing unit tests for Yii applications, you need to configure the test environment and use PHPUnit to test models and components. First, install phpunit and codeception through Composer, use the tests directory and phpunit.xml.dist configuration file in the official template, set YII_ENV to 'test', and create bootstrap.php initialization Yii; then write test cases for the model, such as verifying data rules and attribute tags in UserTest, and automatically rolling back database transactions using DbTestCase; for service classes such as PaymentService, dependencies are isolated through Mock to ensure that the test is independent and has no side effects;

Sep 16, 2025 am 01:12 AM

unit test yii framework

How to implement lazy loading in Yii Active Record?

LazyloadinginYiiActiveRecordautomaticallyfetchesrelateddatawhenaccessed,notduringinitialmodelload.DefinedviahasOne()orhasMany(),relationstriggeradatabasequeryonfirstaccess,asin$order->customer,whichretrievesthecustomeronlywhenneeded.Thiskeepsiniti

Sep 15, 2025 am 12:04 AM

yii

How to format dates and numbers in Yii

Yii provides the Formatter component (yii\i18n\Formatter) to simplify the formatting of dates and numbers. 1. It can use asDate(), asDateTime(), and asTime() for date formatting, and supports predefined formats (such as short, medium) and custom ICU or PHP format; 2. Digital formatting can be implemented through asInteger(), asDecimal(), asPercent(), asCurrency() and other methods, supporting currency, percentage, scientific counting and file size; 3. The dateFormat and da of the formatter component should be set globally in the application configuration.

Sep 14, 2025 am 04:10 AM

yii date formatting

How to create a custom validation rule in Yii?

To create a custom validation rule, you need to define a verification method in the model, such as validateUsername, which receives the attribute name and parameters; 2. Reference the method name in the rules method; 3. Optionally pass parameters and use them through $params in the method; 4. Call $this->addError() when verification fails.

Sep 14, 2025 am 12:07 AM

yii Verification rules

How to handle errors and exceptions in Yii?

Yii's built-in error handler automatically catches PHP errors and exceptions, and controls debug information display by configuring YII_DEBUG; you can customize errorAction to point to specific views to handle error pages such as 404 and 500; use HttpException to throw HTTP exceptions and catch them in try-catch, and combine Yii::error() to record the log to achieve a complete error processing process.

Sep 13, 2025 am 12:35 AM

yii Error handling

How to work with forms and collect user input in Yii

Create a model to define form data and validation rules; 2. Use ActiveForm to generate a secure form in the view; 3. Process submissions through load() and validate() in the controller; 4. Use Yii's CSRF protection, filtering and verification to ensure security; 5. Use UploadedFile class to upload files and set enctype; 6. Use loadMultiple() and validateMultiple() to process multiple inputs; the entire process needs to work together based on the model, view and controller to ensure safe and efficient processing of data, and ultimately achieve safe form submission and response.

Sep 13, 2025 am 12:28 AM

How to use behaviors in Yii to extend components

Behavior is a class in Yii that is used to dynamically extend component functionality, reusing logic by responding to events or adding new method attributes. 1. The behavior is inherited from yii\base\Behavior and can be bound to any Component subclass. 2. Listen to component events by rewriting events() method, such as AR's insertion and update operation. 3. Access the host component through $owner in the event callback and modify its properties. 4. You can declaratively bind through the behaviors() method in the model, or add dynamically by calling attachBehavior() at runtime. 5. Yii built-in TimestampBehavior, SluggableBehavior and other common behaviors, reduce

Sep 12, 2025 am 04:11 AM

yii

How to use Yii's HTML helper class

Yii's HTML helper class safely generates HTML elements through static methods. 1. After importing the class using useyii\helpers\Html, you can directly call static methods; 2. Create tags with Html::tag(), Html::a() generates links, Html::img() outputs pictures and parses alias; 3. Generate form input through Html::textInput(), Html::dropDownList() and other methods; 4. All content is automatically escaped by default to prevent XSS, and use newyii\web\HtmlString when outputting the original HTML; 5. Common methods include Html::encode() encoding and H

Sep 12, 2025 am 03:43 AM

How to perform raw SQL queries in Yii

Use Yii::$app->db to execute native SQL, process the addition, deletion, modification and search operations through createCommand(), and obtain data using queryAll(), queryOne() and other methods. It is necessary to bind parameters to prevent injection. It is recommended to use ActiveRecord or QueryBuilder first to ensure safety and maintainability.

Sep 11, 2025 pm 03:22 PM

yii sql query

How to manage assets like CSS and JavaScript in Yii

Create asset package classes to organize CSS and JS files; 2. Register asset packages in layout or view; 3. Place asset files in the correct directory; 4. Configure versioning and cache clearing through assetManager; 5. Use existing or custom asset packages to manage third-party libraries; 6. Use cssOptions and jsOptions to control loading locations; 7. Register assets in specific views as needed; Through the asset package system, Yii can automatically handle dependencies, releases, versioning and performance optimization, avoid manual hard-coded link or script tags, making front-end resource management more efficient and maintainable.

Sep 11, 2025 am 11:26 AM

How to use GridView in Yii with sorting and filtering

Set up a search model (such as PostSearch) and implement the search() method to return data with filter conditions through ActiveDataProvider; 2. Instantiate the search model in the controller and pass the dataProvider to the view; 3. Use the GridView component in the view and configure filterModel to automatically implement the sorting and filtering functions.

Sep 10, 2025 am 04:14 AM

yii GridView

How to implement pagination for large data sets in Yii

Using ActiveDataProvider combined with Pagination is the standard method for handling large data set paging in Yii2. First, use ActiveDataProvider to configure query, paging size and sorting in the controller, and then use GridView to automatically render paging controls in the view; for performance optimization, when the data volume is huge, COUNT(*) overhead should be avoided, and totalCount can be set to false or use estimates; further improve performance, cursor-based keyset pagination can be used to use index columns (such as ids) for range query to avoid performance degradation caused by OFFSET, and is suitable for infinite scrolling fields.

Sep 10, 2025 am 01:15 AM

How to use the Yii debug toolbar

Installtheyii2-debugextensionviaComposerasadevelopmentdependencyusingcomposerrequire--devyiisoft/yii2-debug.2.Ensurethedebugmoduleisenabledinyourapplicationconfigurationbyaddingittothebootstrapandmodulessectionsinconfig/web.phpwhenYII_ENV_DEVistrue.3

Sep 09, 2025 am 04:17 AM

How to implement caching in a Yii application

After configuring the cache component, select appropriate storage (such as Redis), use the set/get method to cache data in the controller or model, and implement page and fragment cache through PageCache and FragmentCache, and automatically update the cache with dependencies such as DbDependency to improve Yii application performance.

Sep 09, 2025 am 02:18 AM

cache yii