The Page Controller design pattern is a common architectural approach used in web-based systems. It organizes the flow of control by dedicating a specific controller to handle the logic for an individual page or request. This approach helps isolate responsibilities, making the codebase easier to maintain and evolve.
What is the Page Controller?
In the Page Controller pattern, each page (or a group of pages with similar behavior) has its own controller, responsible for:
- Handling the request: Processing data sent from the client.
- Executing the page-specific logic: Validating input, interacting with models, or performing computations.
- Rendering a response: Passing processed data to a view (template) and returning the final response to the client.
Advantages of the Pattern
- Simple flow: Each page is mapped to its own dedicated controller.
- Separation of concerns: Each controller handles only its own logic.
- Maintainability: Changes to one page affect only its associated controller.
- Scalability: Adding new pages is straightforward and doesn’t disrupt existing functionality.
Basic Structure
A typical implementation involves the following components:
- Controllers: PHP files containing logic for specific pages.
- Routes: A routing mechanism to map URLs to controllers.
- Views: Templates used to render the user interface.
Flow
- The client sends a request to a specific URL.
- The routing system identifies the appropriate controller for the request.
- The controller executes the required logic and delegates the response rendering to a view.
- The view generates the final output and returns it to the client.
Implementation Example
File Structure
/htdocs
/src
/Controllers
HomeController.php
AboutController.php
/Services
ViewRenderer.php
/Views
home.html.php
about.html.php
/public
index.php
/routes.php
composer.json
Autoloader
{
"autoload": {
"psr-4": {
"App\": "htdocs/"
}
}
}
composer dump-autoload
Template
Template for the homepage and about.html.php.
<!DOCTYPE html>
<html>
<head>
<title><?= htmlspecialchars($title) ?></title>
</head>
<body>
<h1><?= htmlspecialchars($title) ?></h1>
<p><?= htmlspecialchars($content) ?></p>
</body>
</html>
ViewRenderer
namespace App\Services;
class ViewRenderer {
public function render(string $view, array $data = []): void {
extract($data); // Turns array keys into variables
include __DIR__ . "/../../Views/{$view}.html.php";
}
}
HomeController
Handles the homepage logic.
namespace App\Controllers;
use App\Services\ViewRenderer;
class HomeController {
public function __construct(private ViewRenderer $viewRenderer)
{
}
public function handleRequest(): void {
$data = [
'title' => 'Welcome to the Site',
'content' => 'Homepage content.',
];
$this->viewRenderer->render('home', $data);
}
}
AboutController
Handles the "About Us" page logic.
namespace App\Controllers;
use App\Services\ViewRenderer;
class AboutController
{
public function __construct(private ViewRenderer $viewRenderer)
{
}
public function handleRequest(): void {
$data = [
'title' => 'About Us',
'content' => 'Information about the company.',
];
$this->viewRenderer->render('about', $data);
}
}
routes.php
Defines route mappings to controllers.
use App\Controllers\HomeController;
use App\Controllers\AboutController;
// Define the routes in an associative array
return [
'/' => HomeController::class,
'/about' => AboutController::class,
];
index.php
The application’s entry point.
/htdocs
/src
/Controllers
HomeController.php
AboutController.php
/Services
ViewRenderer.php
/Views
home.html.php
about.html.php
/public
index.php
/routes.php
composer.json
Pros and Cons
Advantages
- Organization: Controllers are modular, each handling a specific page.
- Reusability: Views can be reused across different controllers.
- Debugging: Errors are easier to trace since each page has its own dedicated controller.
Disadvantages
- Increased number of controllers: Large projects can lead to a proliferation of controllers, requiring better organization.
- Code duplication: Common logic across controllers may be repeated. This can be mitigated by using a base controller class.
When to Use the Page Controller Pattern?
- Simple systems: Best for small to medium-sized web applications where each page has specific logic.
- Modular projects: When you want to isolate logic for easier maintenance.
- Without frameworks: Ideal for PHP projects without robust frameworks (like Laravel or Symfony).
For more complex projects, where there is significant logic reuse or multiple entry points, patterns like Front Controller or full MVC architecture may be more suitable.
The above is the detailed content of PHP Design Patterns: Page Controller. 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
php regex for password strength
Jul 03, 2025 am 10:33 AM
To determine the strength of the password, it is necessary to combine regular and logical processing. The basic requirements include: 1. The length is no less than 8 digits; 2. At least containing lowercase letters, uppercase letters, and numbers; 3. Special character restrictions can be added; in terms of advanced aspects, continuous duplication of characters and incremental/decreasing sequences need to be avoided, which requires PHP function detection; at the same time, blacklists should be introduced to filter common weak passwords such as password and 123456; finally it is recommended to combine the zxcvbn library to improve the evaluation accuracy.
PHP Variable Scope Explained
Jul 17, 2025 am 04:16 AM
Common problems and solutions for PHP variable scope include: 1. The global variable cannot be accessed within the function, and it needs to be passed in using the global keyword or parameter; 2. The static variable is declared with static, and it is only initialized once and the value is maintained between multiple calls; 3. Hyperglobal variables such as $_GET and $_POST can be used directly in any scope, but you need to pay attention to safe filtering; 4. Anonymous functions need to introduce parent scope variables through the use keyword, and when modifying external variables, you need to pass a reference. Mastering these rules can help avoid errors and improve code stability.
How to handle File Uploads securely in PHP?
Jul 08, 2025 am 02:37 AM
To safely handle PHP file uploads, you need to verify the source and type, control the file name and path, set server restrictions, and process media files twice. 1. Verify the upload source to prevent CSRF through token and detect the real MIME type through finfo_file using whitelist control; 2. Rename the file to a random string and determine the extension to store it in a non-Web directory according to the detection type; 3. PHP configuration limits the upload size and temporary directory Nginx/Apache prohibits access to the upload directory; 4. The GD library resaves the pictures to clear potential malicious data.
Commenting Out Code in PHP
Jul 18, 2025 am 04:57 AM
There are three common methods for PHP comment code: 1. Use // or # to block one line of code, and it is recommended to use //; 2. Use /.../ to wrap code blocks with multiple lines, which cannot be nested but can be crossed; 3. Combination skills comments such as using /if(){}/ to control logic blocks, or to improve efficiency with editor shortcut keys, you should pay attention to closing symbols and avoid nesting when using them.
Tips for Writing PHP Comments
Jul 18, 2025 am 04:51 AM
The key to writing PHP comments is to clarify the purpose and specifications. Comments should explain "why" rather than "what was done", avoiding redundancy or too simplicity. 1. Use a unified format, such as docblock (/*/) for class and method descriptions to improve readability and tool compatibility; 2. Emphasize the reasons behind the logic, such as why JS jumps need to be output manually; 3. Add an overview description before complex code, describe the process in steps, and help understand the overall idea; 4. Use TODO and FIXME rationally to mark to-do items and problems to facilitate subsequent tracking and collaboration. Good annotations can reduce communication costs and improve code maintenance efficiency.
How Do Generators Work in PHP?
Jul 11, 2025 am 03:12 AM
AgeneratorinPHPisamemory-efficientwaytoiterateoverlargedatasetsbyyieldingvaluesoneatatimeinsteadofreturningthemallatonce.1.Generatorsusetheyieldkeywordtoproducevaluesondemand,reducingmemoryusage.2.Theyareusefulforhandlingbigloops,readinglargefiles,or
Quick PHP Installation Tutorial
Jul 18, 2025 am 04:52 AM
ToinstallPHPquickly,useXAMPPonWindowsorHomebrewonmacOS.1.OnWindows,downloadandinstallXAMPP,selectcomponents,startApache,andplacefilesinhtdocs.2.Alternatively,manuallyinstallPHPfromphp.netandsetupaserverlikeApache.3.OnmacOS,installHomebrew,thenrun'bre
Learning PHP: A Beginner's Guide
Jul 18, 2025 am 04:54 AM
TolearnPHPeffectively,startbysettingupalocalserverenvironmentusingtoolslikeXAMPPandacodeeditorlikeVSCode.1)InstallXAMPPforApache,MySQL,andPHP.2)Useacodeeditorforsyntaxsupport.3)TestyoursetupwithasimplePHPfile.Next,learnPHPbasicsincludingvariables,ech
