Get started using the yii framework

To add new validation rules in Yii, you only need to modify the rules() method of the model. 1. Open the model file such as User.php; 2. Add a new rule in the return array of the rules() method, in the format [Properties, Verifier, Options], such as ['age','integer','min'=>1,'max'=>120]; 3. You can use built-in validators such as 'required', 'email' or custom inline validators; 4. You can specify the scene or 'when' to set the conditions; 5. Finally, by calling validate() and checking getErrors() to test whether the rule takes effect. This process is complete and easy to implement.

Install Yii2: Use Composer to run composercreate-projectyiisoft/yii2-app-basicmyapp to create a project; 2. Set up the web server: enter the project directory and run phpyiiserve to start the development server; 3. Understand the directory structure: master the core directory uses config/, controllers/, models/, views/, web/ and other core directories; 4. Configure the database: Modify the DSN, username and password in config/db.php to connect to the database; 5. Use Gii to generate code: Enable the Gii module in config/web.php, and use

Create a search model (such as PostSearch) that inherits the autonomous model, define verification rules and implement search methods, and use ActiveDataProvider to manage query results; 2. Instantiate the search model in the controller and pass in request parameters to perform searches; 3. Use ActiveForm to build a search form in the view, display the results through GridView, set filterModel to enable column filtering; 4. Add public attributes to the associated fields (such as author_name) in the search model, and associate query through joinWith; 5. Optionally expand the filter logic, support date range, pull-down filtering, etc. This method uses Yii2 components to achieve high

To optimize database query performance, you must first ensure that the database design is reasonable, add indexes for columns involved in WHERE, JOIN, ORDERBY and GROUPBY, use composite indexes and avoid excessive indexing; 2. Use Yii's query caching function to cache frequently read and have fewer changes through the cache() method to reduce database access; 3. Optimize the use of ActiveRecord, avoid SELECT*, select only necessary fields, use asArray() to reduce memory overhead, and avoid N 1 query problems through with(); 4. Use joinWith() for complex queries or directly use createCommand() to execute native SQL for higher performance; 5.

Install and configure Codeception, use composerrequire--devcodeception/codeception and run bootstrap initialization; 2. Generate acceptancesuite and configure PhpBrowser or WebDriver through tests/acceptance.suite.yml; 3. Write a Cest test class to simulate user behavior, such as accessing pages, filling in forms, clicking buttons and verifying results; 4. Run vendor/bin/codeceptrunaccep after starting the local server and Selenium (such as using WebDriver)

DisabledebugmodeandsetYII_DEBUGtofalse,2.UploadcodeviaGit,SFTP,orCI/CDandruncomposerinstall--no-devonserver,3.InstallPHP7.4 withrequiredextensionsandconfigureApacheorNginxwithproperrewriterules,4.Setfilepermissionswithchmod755andchownforruntimeandweb

Common errors when using the Yii framework include configuration errors, database connection errors, and verification errors. 1. Configuration error: Check the config/web.php or config/main.php file to ensure there are no spelling errors or path errors. 2. Database connection error: Make sure the db.php file is configured correctly and the database server is running normally. 3. Verification error: Check the model rules to ensure that the verification settings meet application requirements.

Yii's QueryBuilder supports efficient and secure construction of complex database queries by providing smooth interfaces. 1. Use leftJoin() and other methods to achieve multi-table association and avoid field ambiguity; 2. Nesting subqueries in WHERE or SELECT to handle dynamic filtering or aggregated data; 3. Dynamically add where, orderBy and other conditions according to runtime conditions; 4. Combine groupBy() and having() to filter the aggregate results; 5. Use union() to merge query results compatible with multiple structures; 6. Securely insert SQL expressions through yii\db\Expression; 7. Combine limit and offset to realize pagination and use c