Backend Development
PHP Tutorial
How Can PHP's Post-Redirect-Get (PRG) Pattern Prevent Form Resubmission and Back Button Issues?
How Can PHP's Post-Redirect-Get (PRG) Pattern Prevent Form Resubmission and Back Button Issues?
Dec 11, 2024 pm 09:34 PM
Reliance on a Proven Technique: PHP Post-Redirect-Get (PRG) Pattern
In software development, implementing secure and reliable workflows is essential. The PHP Post-Redirect-Get (PRG) pattern is a popular and well-established technique to prevent form resubmission and back button issues.
A Practical PHP Example
To understand the simplicity of PRG, let's dive into a basic PHP example:
if ($_POST) {
// Validate the input
if (/* input is valid */) {
// Perform essential operations (database updates, etc.)
// Redirect to the same page
header("Location: {$_SERVER['REQUEST_URI']}", true, 303);
exit();
}}
?>
Implementation Details
The key points to note are:
- 1. Input Validation: Input validation is performed on POST data to ensure valid user input.
- 2. Redirect upon Validation: If validation succeeds, a redirect back to the same page occurs using the REQUEST_URI to maintain the URL.
- 3. Code Execution: Critical code (e.g., database updates) is executed before the redirect.
- 4. HTTP Response Code: A 303 See Other HTTP status code is used in the header to indicate a redirect.
- 5. Exit the Script: Exit immediately after the redirect to prevent any further execution.
Avoid Reinventing the Wheel
By leveraging the PRG pattern, you can confidently implement secure and reliable form submission. This well-established technique is widely adopted, eliminating the need to reinvent these principles. Embrace PRG for its proven effectiveness in mitigating common form submission issues.
The above is the detailed content of How Can PHP's Post-Redirect-Get (PRG) Pattern Prevent Form Resubmission and Back Button Issues?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How do I stay up-to-date with the latest PHP developments and best practices?
Jun 23, 2025 am 12:56 AM
TostaycurrentwithPHPdevelopmentsandbestpractices,followkeynewssourceslikePHP.netandPHPWeekly,engagewithcommunitiesonforumsandconferences,keeptoolingupdatedandgraduallyadoptnewfeatures,andreadorcontributetoopensourceprojects.First,followreliablesource
What is PHP, and why is it used for web development?
Jun 23, 2025 am 12:55 AM
PHPbecamepopularforwebdevelopmentduetoitseaseoflearning,seamlessintegrationwithHTML,widespreadhostingsupport,andalargeecosystemincludingframeworkslikeLaravelandCMSplatformslikeWordPress.Itexcelsinhandlingformsubmissions,managingusersessions,interacti
How to set PHP time zone?
Jun 25, 2025 am 01:00 AM
TosettherighttimezoneinPHP,usedate_default_timezone_set()functionatthestartofyourscriptwithavalididentifiersuchas'America/New_York'.1.Usedate_default_timezone_set()beforeanydate/timefunctions.2.Alternatively,configurethephp.inifilebysettingdate.timez
How do I validate user input in PHP to ensure it meets certain criteria?
Jun 22, 2025 am 01:00 AM
TovalidateuserinputinPHP,usebuilt-invalidationfunctionslikefilter_var()andfilter_input(),applyregularexpressionsforcustomformatssuchasusernamesorphonenumbers,checkdatatypesfornumericvalueslikeageorprice,setlengthlimitsandtrimwhitespacetopreventlayout
What are the best practices for writing clean and maintainable PHP code?
Jun 24, 2025 am 12:53 AM
The key to writing clean and easy-to-maintain PHP code lies in clear naming, following standards, reasonable structure, making good use of comments and testability. 1. Use clear variables, functions and class names, such as $userData and calculateTotalPrice(); 2. Follow the PSR-12 standard unified code style; 3. Split the code structure according to responsibilities, and organize it using MVC or Laravel-style catalogs; 4. Avoid noodles-style code and split the logic into small functions with a single responsibility; 5. Add comments at key points and write interface documents to clarify parameters, return values ??and exceptions; 6. Improve testability, adopt dependency injection, reduce global state and static methods. These practices improve code quality, collaboration efficiency and post-maintenance ease.
What is data serialization in PHP (serialize(), unserialize())?
Jun 22, 2025 am 01:03 AM
ThePhpfunctionSerialize () andunserialize () AreusedtoconvertcomplexdaTastructdestoresintostoraSandaBackagain.1.Serialize () c OnvertsdatalikecarraysorobjectsraystringcontainingTypeandstructureinformation.2.unserialize () Reconstruct theoriginalatataprom
How do I embed PHP code in an HTML file?
Jun 22, 2025 am 01:00 AM
You can embed PHP code into HTML files, but make sure that the file has an extension of .php so that the server can parse it correctly. Use standard tags to wrap PHP code, insert dynamic content anywhere in HTML. In addition, you can switch PHP and HTML multiple times in the same file to realize dynamic functions such as conditional rendering. Be sure to pay attention to the server configuration and syntax correctness to avoid problems caused by short labels, quotation mark errors or omitted end labels.
How do I execute SQL queries using PHP?
Jun 24, 2025 am 12:54 AM
Yes,youcanrunSQLqueriesusingPHP,andtheprocessinvolveschoosingadatabaseextension,connectingtothedatabase,executingqueriessafely,andclosingconnectionswhendone.Todothis,firstchoosebetweenMySQLiorPDO,withPDObeingmoreflexibleduetosupportingmultipledatabas
