What is the Blade templating engine in Laravel?
BladeisatemplatingengineinLaravelthatsimplifiesseparatingPHPlogicfromHTMLviews.Itallowsdeveloperstowriteclean,readabletemplatesusingdynamiccontent,controlstructures,andreusablelayouts.Bladefilesusethe.blade.phpextensionandsupportvariablesvia{{$variab
Jun 21, 2025 am 12:55 AM
How do I handle form submissions in Laravel?
Five core steps are required to handle form submission in Laravel: first, define POST routes in web.php, such as Route::post('/submit-form',[FormController::class,'handleForm']) and ensure that the form contains @csrf; second, use Artisan to create a controller and define the handleForm method to receive the Request object to obtain the input value; third, use validate() method to verify the input data and display error information with Blade; fourth, if the file is uploaded, add enctype="multipart/form-dat
Jun 21, 2025 am 12:46 AM
What are controller middleware, and how do I use them?
Controllermiddleware is a mechanism bound to the controller or its method to execute specific logic before and after request processing. 1. It is a function that runs before or after the request reaches the controller, used to implement functions such as authentication, permission control, logging, etc.; 2. Common usage scenarios include user authentication, permission checking, parameter processing, current limit and anti-brushing, etc., for example, in Express, access is restricted through a custom ensureAdmin function; 3. There are slightly different usage methods in different frameworks, such as Laravel binds middleware through constructors, Express uses app.use or routes to specify, and NestJS uses decorator method; 4. Practical suggestions include reasonable splitting logic,
Jun 21, 2025 am 12:44 AM
How do I create forms in Laravel?
LaravelprovidesacleanandefficientwaytocreateformsusingBladetemplates,controllers,andvalidation.1.UseBladetemplatestobuildHTMLformswith@csrfand@methoddirectivesforsecurityandHTTPmethods.2.HandleformsubmissionincontrollersviaRequestclasses.3.Validatein
Jun 21, 2025 am 12:36 AM
What are route middleware in Laravel?
Laravel's routing middleware is a mechanism for filtering HTTP requests. It is divided into global middleware and routing middleware, where the routing middleware is bound to a specific route, and is registered in app/Http/Kernel.php, such as 'auth' and 'admin', and is applied using the middleware method in the route definition or controller constructor; common uses include authentication checking, permission control, logging, request frequency limit, etc.; for example, creating CheckAdmin middleware and implementing judgment logic through the handle method; middleware also supports parameter passing, such as passing parameters through 'role:editor,admin' and receiving in the handle method to achieve more
Jun 21, 2025 am 12:30 AM
How do I run migrations in Laravel? (php artisan migrate)
When running phpartisanmigrate, Laravel will execute all migration files to be run in the database/migrations directory in the order of timestamps, and record the executed migrations through the migrations table in the database; common uses include: 1. phpartisanmigrate performs all unrun migrations; 2. phpartisanmigrate--step execution in batches; 3. phpartisanmigrate:fresh clears and recreates the table; 4. phpartisanmigrate:refresh rolls back and reruns all migrations; 5. phpartisa
Jun 21, 2025 am 12:27 AM
What are policies in Laravel, and how are they used?
InLaravel,policiesorganizeauthorizationlogicformodelactions.1.Policiesareclasseswithmethodslikeview,create,update,anddeletethatreturntrueorfalsebasedonuserpermissions.2.Toregisterapolicy,mapthemodeltoitspolicyinthe$policiesarrayofAuthServiceProvider.
Jun 21, 2025 am 12:21 AM
What is the VerifyCsrfToken middleware?
VerifyCsrfToken is a middleware in Laravel to prevent CSRF attacks. Its core mechanism is to ensure that the request source is legitimate by verifying the CSRFTToken in the request. 1. It generates a unique token when the user accesses the form page and embeds the form; 2. Verify whether the token is consistent when submitting, otherwise the request will be rejected; 3. Mainly verify POST, PUT, PATCH, DELETE requests, and GET requests do not verify by default; 4. You can skip verification by adding routes in the $except attribute, but you need to use it with caution; 5. It is recommended to use Sanctum or Passport to manage the token for SPA or API scenarios.
Jun 21, 2025 am 12:14 AM
What are migrations in Laravel, and how are they used?
Laravel migration is a database version control tool that defines and modifies database structure through PHP code to improve collaboration efficiency and environmental consistency. The migration file contains up() and down() methods. The former is used to create or modify database elements, such as tables and fields, and the latter is used to roll back changes. For example, when creating a "users" table, the up() method defines the table structure, and the down() method deletes the table. Laravel provides Artisan command to simplify the migration process: use phpartisanmake:migration to generate migration files, combine with model creation to use phpartisanmake:modelUser-mf command, and use phpa to execute migration.
Jun 20, 2025 am 12:42 AM
How do I use dependency injection in a controller?
Dependencyinjectioninacontrollerallowstheframeworktosupplyrequiredservices,enhancingtestabilityandmaintainability.1.Useconstructorinjectionbydeclaringdependenciesintheconstructorparameters.2.RegisterservicesinstartupfileslikeProgram.cswithappropriate
Jun 20, 2025 am 12:41 AM
What are controllers in Laravel, and what is their purpose?
The main role of the controller in Laravel is to process HTTP requests and return responses to keep the code neat and maintainable. By concentrating the relevant request logic into a class, the controller makes the routing file simpler, such as putting user profile display, editing and deletion operations in different methods of UserController. The creation of a controller can be implemented through the Artisan command phpartisanmake:controllerUserController, while the resource controller is generated using the --resource option, covering methods for standard CRUD operations. Then you need to bind the controller in the route, such as Route::get('/user/{id
Jun 20, 2025 am 12:31 AM
How do I use form model binding to populate form fields with data?
Form model binding is an efficient way to fill form fields, especially in frameworks such as Laravel or ASP.NETCore. You first get the model data from the database, then pass it to the view, and bind the model in the form to automatically fill in the input fields. For example, if you use Form::model() in Laravel and pass in user data, you can automatically fill in the name and email fields. However, it should be noted that the field name must exactly match the model attributes; nested models need to use special syntax such as address[street]; verification errors may overwrite the binding value and should be used in conjunction with old(); some scenarios such as multi-model merging or permission control are more suitable for manual binding. Rational use of model binding can improve development
Jun 20, 2025 am 12:30 AM
How do I create a new seeder in Laravel? (php artisan make:seeder)
The method to create a new seeder in Laravel is to use the phpartisanmake:seeder command, 1. Execute the command such as phpartisanmake:seederUsersTableSeeder to generate a Seeder file; 2. Write the insertion data logic in the run() method, and it is recommended to use the model factory to create data; 3. Add the new seeder to the run() method of DatabaseSeeder.php to call it; 4. You can use the --class parameter to run the specified seeder separately, or run all seeders. The entire process needs to pay attention to the order of Seeder calls and the complete database configuration.
Jun 20, 2025 am 12:24 AM
How do I create a database table associated with an Eloquent model?
Create a database table associated with the Eloquent model in Laravel to define the structure through migration. 1. Use phpartisanmake:modelArticle-mf to generate models, migrations and factories at the same time; 2. If only migration is required, run phpartisanmake:migrationcreate_articles_table; 3. Define fields in the up() method of the migration file, such as id, title, content, foreign key user_id, and use foreignId to establish constraints; 4. It is recommended to use plural forms in the table name and is consistent with the $table attribute in the model; 5. Run phpartisanm
Jun 20, 2025 am 12:22 AM
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