In laravel, the old() method is used to take out the information in the session. The syntax is "value="{{old('name')}}""; when the form submission fails, laravel will Flash the data entered by the user into a one-time session, and old can retrieve the flash data.
#The operating environment of this article: Windows 10 system, Laravel version 6, Dell G3 computer.
How to use the old method in laravel
Since the error message will be flashed into the session, the old function takes out the information in the session
value="{{old('name')}}"
When the user submits the form After failure, Laravel will automatically flash the user's input data into a one-time session (this data will be lost as soon as it is refreshed, so it is called one-time data). Then old(‘name’) can take out the flash memory data in the session, thus preventing the user from re-entering it.
Using old() can take out the last submitted data from the one-time session and hang it on the DOM element, thus preventing the user from re-entering.
The example is as follows:
The traditional submission form page will be refreshed and the content in the input box will be lost. laravel
Better user experience Solution withInput() old()session
laravel will automatically save the data entered by the user into a one-time session. Function
Using old() can take out the last submitted data from the one-time session and hang it on the DOM element, thus preventing the user from re-entering it. input
Use withInput() and the with method to write the parameters you want to return into the session. The blade template can take out the value from the session to make some logical judgments. it
return redirect()-> back()->withInput()->with(['error'=>'注册失败,短信验证码不正确','page'=>'phone']);
blade template old() assignment function writing method io
<input type="text" name="username" value="{{ old('username') }}">
[Related recommendations: laravel video tutorial]
The above is the detailed content of How to use old method in laravel. For more information, please follow other related articles on the PHP Chinese website!

Laravel stands out by simplifying the web development process and delivering powerful features. Its advantages include: 1) concise syntax and powerful ORM system, 2) efficient routing and authentication system, 3) rich third-party library support, allowing developers to focus on writing elegant code and improve development efficiency.

Laravelispredominantlyabackendframework,designedforserver-sidelogic,databasemanagement,andAPIdevelopment,thoughitalsosupportsfrontenddevelopmentwithBladetemplates.

Laravel and Python have their own advantages and disadvantages in terms of performance and scalability. Laravel improves performance through asynchronous processing and queueing systems, but due to PHP limitations, there may be bottlenecks when high concurrency is present; Python performs well with the asynchronous framework and a powerful library ecosystem, but is affected by GIL in a multi-threaded environment.

Laravel is suitable for projects that teams are familiar with PHP and require rich features, while Python frameworks depend on project requirements. 1.Laravel provides elegant syntax and rich features, suitable for projects that require rapid development and flexibility. 2. Django is suitable for complex applications because of its "battery inclusion" concept. 3.Flask is suitable for fast prototypes and small projects, providing great flexibility.

Laravel can be used for front-end development. 1) Use the Blade template engine to generate HTML. 2) Integrate Vite to manage front-end resources. 3) Build SPA, PWA or static website. 4) Combine routing, middleware and EloquentORM to create a complete web application.

PHP and Laravel can be used to build efficient server-side applications. 1.PHP is an open source scripting language suitable for web development. 2.Laravel provides routing, controller, EloquentORM, Blade template engine and other functions to simplify development. 3. Improve application performance and security through caching, code optimization and security measures. 4. Test and deployment strategies to ensure stable operation of applications.

Laravel and Python have their own advantages and disadvantages in terms of learning curve and ease of use. Laravel is suitable for rapid development of web applications. The learning curve is relatively flat, but it takes time to master advanced functions. Python's grammar is concise and the learning curve is flat, but dynamic type systems need to be cautious.

Laravel's advantages in back-end development include: 1) elegant syntax and EloquentORM simplify the development process; 2) rich ecosystem and active community support; 3) improved development efficiency and code quality. Laravel's design allows developers to develop more efficiently and improve code quality through its powerful features and tools.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version
Chinese version, very easy to use

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.