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    <blockquote id="ogq9d"></blockquote>

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    <thead id="ogq9d"><font id="ogq9d"></font></thead>

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    \n

    <\/h1>\n

    <\/p>\n<\/body>\n<\/html>\n<\/pre>\n\n\n\n

    ViewRenderer<\/strong>
    \n<\/p>\n\n

    namespace App\\Services;\n\nclass ViewRenderer {\n\n    public function render(string $view, array $data = []): void {\n        extract($data); \/\/ Turns array keys into variables\n        include __DIR__ . \"\/..\/..\/Views\/{$view}.html.php\";\n    }\n}\n<\/pre>\n\n\n\n

    HomeController<\/strong><\/p>\n\n

    Handles the homepage logic.
    \n<\/p>\n\n

    namespace App\\Controllers;\n\nuse App\\Services\\ViewRenderer;\n\nclass HomeController {\n\n    public function __construct(private ViewRenderer $viewRenderer)\n    {\n    }\n\n    public function handleRequest(): void {\n        $data = [\n            'title' => 'Welcome to the Site',\n            'content' => 'Homepage content.',\n        ];\n\n        $this->viewRenderer->render('home', $data);\n    }\n}\n<\/pre>\n\n\n\n

    AboutController<\/strong><\/p>\n\n

    Handles the \"About Us\" page logic.
    \n<\/p>\n\n

    namespace App\\Controllers;\n\nuse App\\Services\\ViewRenderer;\n\nclass AboutController\n{\n\n    public function __construct(private ViewRenderer $viewRenderer)\n    {\n    }\n\n    public function handleRequest(): void {\n        $data = [\n            'title' => 'About Us',\n            'content' => 'Information about the company.',\n        ];\n\n        $this->viewRenderer->render('about', $data);\n    }\n}\n<\/pre>\n\n\n\n

    routes.php<\/strong><\/p>\n\n

    Defines route mappings to controllers.
    \n<\/p>\n\n

    use App\\Controllers\\HomeController;\nuse App\\Controllers\\AboutController;\n\n\/\/ Define the routes in an associative array\nreturn [\n    '\/' => HomeController::class,\n    '\/about' => AboutController::class,\n];\n<\/pre>\n\n\n\n

    index.php<\/strong><\/p>\n

    The application’s entry point.
    \n<\/p>\n\n

    \/htdocs\n    \/src\n        \/Controllers\n            HomeController.php\n            AboutController.php\n        \/Services\n            ViewRenderer.php\n        \/Views\n            home.html.php\n            about.html.php\n    \/public\n        index.php\n    \/routes.php\n    composer.json\n<\/pre>\n\n\n\n

    \n \n \n Pros and Cons\n<\/h2>\n\n

    Advantages<\/strong><\/p>\n\n

      \n
    • \nOrganization<\/strong>: Controllers are modular, each handling a specific page.<\/li>\n
    • \nReusability<\/strong>: Views can be reused across different controllers.<\/li>\n
    • \nDebugging<\/strong>: Errors are easier to trace since each page has its own dedicated controller.<\/li>\n<\/ul>\n\n

      Disadvantages<\/strong><\/p>\n\n

        \n
      • \nIncreased number of controllers<\/strong>: Large projects can lead to a proliferation of controllers, requiring better organization.<\/li>\n
      • \nCode duplication<\/strong>: Common logic across controllers may be repeated. This can be mitigated by using a base controller class.<\/li>\n<\/ul>\n\n

        \n \n \n When to Use the Page Controller Pattern?\n<\/h2>\n\n
          \n
        • \nSimple systems<\/strong>: Best for small to medium-sized web applications where each page has specific logic.<\/li>\n
        • \nModular projects<\/strong>: When you want to isolate logic for easier maintenance.<\/li>\n
        • \nWithout frameworks<\/strong>: Ideal for PHP projects without robust frameworks (like Laravel or Symfony).<\/li>\n<\/ul>\n\n

          For more complex projects, where there is significant logic reuse or multiple entry points, patterns like Front Controller<\/strong> or full MVC architecture<\/strong> may be more suitable.<\/p>\n\n\n \n\n \n \n\n \n "}

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          Home Backend Development PHP Tutorial PHP Design Patterns: Page Controller

          PHP Design Patterns: Page Controller

          Dec 28, 2024 am 07:42 AM

          PHP Design Patterns: Page Controller

          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:

          1. Handling the request: Processing data sent from the client.
          2. Executing the page-specific logic: Validating input, interacting with models, or performing computations.
          3. Rendering a response: Passing processed data to a view (template) and returning the final response to the client.

          Advantages of the Pattern

          1. Simple flow: Each page is mapped to its own dedicated controller.
          2. Separation of concerns: Each controller handles only its own logic.
          3. Maintainability: Changes to one page affect only its associated controller.
          4. 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

          1. The client sends a request to a specific URL.
          2. The routing system identifies the appropriate controller for the request.
          3. The controller executes the required logic and delegates the response rendering to a view.
          4. 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!

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