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Technical Articles

PHP Framework

What are Laravel Contracts and when should I use them?

LaravelContracts should be used when decoupling, testability and flexibility are required, including: 1. When you want to separate the code from implementation details, rely on interfaces rather than specific implementations; 2. When you write testable code, it is convenient to simulate interface behavior in unit tests; 3. When you develop reusable packages or components, ensure compatibility with different service configurations; 4. When you need to easily switch service implementations, bind different implementation classes through service containers. Compared with Facades, Contracts is more suitable for large applications and professional-level code structures. Because it supports dependency injection, reduces coupling and improves maintenance, Contracts should be preferred in scenarios that pursue high maintainability and scalability.

Aug 01, 2025 am 06:48 AM

laravel

How to handle CORS issues in a Laravel API?

To solve the CORS problem in Laravel, you should use the built-in CORS configuration and set the parameters correctly: 1. Make sure that the fruitcake/laravel-cors configuration file is installed and released (Laravel9 is already built-in); 2. Set allowed_origins as the front-end domain name in config/cors.php to avoid using [''] in production environment; 3. Set allowed_methods and allowed_headers to [''] or specific values; 4. Enable supports_credentials=>true to

Aug 01, 2025 am 06:47 AM

laravel cors

How to use contracts (interfaces) in Laravel?

Laravelcontractsareinterfacesthatdefinecoreservices,enablingdecoupledandtestablecodebydependingonabstractionsratherthanimplementations;1.UnderstandthatcontractslikeIlluminate\Contracts\Cache\Repositoryserveasblueprintsforfeatures;2.Usethemintype-hint

Aug 01, 2025 am 06:40 AM

How to manage database migrations in Laravel?

Laravel's database migration management ensures smooth team collaboration and deployment through version control. 1. Migration is a database version control tool that uses PHP code to define schema changes. Each migration includes up() execution changes and down() rollback changes. 2. Use phpartisanmake:migration to create migrations, and quickly generate them with --create or --table parameters; use SchemaBuilder to define structures in up(), such as creating tables, adding fields and foreign keys. 3. Run the migration through phpartisanmigrate, migrate:rollback falls back to the previous batch, migrate:reset resets all

Aug 01, 2025 am 06:38 AM

laravel Database migration

What are access control filters in Yii?

AccesscontrolinYii2ismanagedusingtheAccessControlfilter,whichsecurescontrolleractionsbasedonuserrolesorauthenticationstatus.1.Itisimplementedbyoverridingthebehaviors()methodinacontrolleranddefiningaccessrules.2.Eachrulespecifieswhethertoallowordenyac

Aug 01, 2025 am 06:10 AM

yii Access control

Using Environment variables (.env file) in Laravel.

In the Laravel project, the .env file is used to manage environment variables and improve security and maintainability. To load .env files correctly, Laravel will automatically read by default, but in some server environments, you need to run the phpartisanconfig:clear and phpartisanconfig:cache commands to ensure that variables are cached correctly; configurations suitable for .env include database connections, API keys, application switches and third-party service configurations; when using it, you should pay attention to the default variable types as strings, avoid repeated definitions, preferential use of config() instead of env(), and support multi-environment configuration through .env.testing and other files, while avoiding sensitivity

Aug 01, 2025 am 05:42 AM

laravel .env file

How to create a contact form and send emails in Laravel?

Create a contact form in the Blade view and include verification error prompts; 2. Define the route for form display and submission in web.php; 3. Create a ContactController and implement a send method with verification there; 4. Use the artisan command to generate a ContactMail mail class and set a constructor and email content construction; 5. Create an emails.contactBlade template for mail content display; 6. Configure the correct email driver and credentials in the .env file; 7. Display a successful message on the form page and handle verification errors; Optionally, use the ShouldQueue interface to add the mail to the queue and send asynchronously, and finally realize Lar

Aug 01, 2025 am 05:37 AM

laravel Contact form

How to install a Laravel package?

InstallthepackageusingComposerwithcomposerrequirevendor/package-name.2.Mostpackagesauto-registerviaLaravel’spackageauto-discovery,somanualregistrationinconfig/app.phpisusuallyunnecessary.3.Publishconfiguration,migrations,orassetsusingphpartisanvendor

Aug 01, 2025 am 04:52 AM

What is the MVC pattern in Laravel?

TheMVCpatterninLaravelseparatesanapplicationintothreecomponents:1.Model–handlesdatalogicusingEloquentORMtointeractwiththedatabase,2.View–managestheuserinterfacewithBladetemplatesinresources/views,3.Controller–processesrequests,interactswithmodels,and

Aug 01, 2025 am 04:38 AM

laravel mvc mode

How to create custom helper functions in Laravel?

Create app/Helpers/helpers.php file and define functions such as formatPrice, isActiveRoute and uploadImage; 2. Add helpers.php path in autoload.files of composer.json; 3. Run composerdump-autoload to make the functions globally available; 4. Use these functions anywhere in view, controller, etc.; 5. If the functions increase, you can split multiple auxiliary files and register them to autoload.files; 6. Follow best practices to avoid logical complexity and naming conflicts, and ultimately achieve simple and efficient global function reuse.

Aug 01, 2025 am 03:29 AM

How to write unit and feature tests in Laravel?

Unittestsfocusonisolatedcomponentslikeservicemethods,whilefeaturetestscheckintegrateduserflowslikeformsubmissions.2.Laravel’stestsdirectoryincludesUnitandFeaturefolders,andtestsarerunusingphpartisantestwithoptional--testsuitefilters.3.Writeunittestsf

Aug 01, 2025 am 01:57 AM

laravel unit test

How to get the current logged-in user in Laravel?

Useauth()->user()orAuth::user()togettheauthenticateduserinstance.2.Useauth()->id()orAuth::id()toretrieveonlytheuserID.3.Checkloginstatuswithauth()->check()beforeaccessinguserdata.4.InBlade,use@authorauth()->check()toconditionallydisplayco

Aug 01, 2025 am 01:52 AM

How to work with lazy collections in Laravel?

UselazycollectionsinLaravelwhenprocessinglargedatasetssuchasEloquentqueries,bigarrays,orfilestoavoidmemoryexhaustion.2.CreatealazycollectionfromEloquentusinglazy()orcursor(),withlazy()preferredforbettermethodsupport.3.Generatelazycollectionsfromlarge

Aug 01, 2025 am 01:13 AM

laravel

How to work with request headers and responses in Laravel?

LaravelallowseasyaccesstorequestheadersviatheRequestobjectorrequest()helper,suchas$request->header('Content-Type')orrequest()->header('X-Forwarded-For').Youcancheckforheaderexistenceusing$request->hasHeader('X-API-Key')andretrieveallheadersw

Aug 01, 2025 am 12:19 AM

laravel http request