How to Dynamically Load Classes Based on Pretty URLs in an MVC Framework?

How to load a class based on a pretty URL in a Model View Controller (MVC) page

Question: How to load a class based on Dynamically expanding controller with new category composed of pretty URLs?

Solution:

To resolve this issue, the following steps need to be taken:

1. Separate autoloading and routing: Autoloading and routing are different concepts and should be handled by different classes.
2. Autoload classes using an autoloader: An autoloader can be registered using the spl_autoload_register() function, which will automatically call it whenever an undefined class is attempted.
3. Manage class files using namespaces: Namespaces prevent classes with the same name from being used in different directories and simplify the loading of class files.
4. Use regular expressions to parse pretty URLs: Avoid using explode() and instead use regular expression patterns to parse the URL and extract the required segments.
5. Use routing table to match URLs: Create a routing table based on regular expression patterns and default values ​​to match a given URL to the corresponding controller and method.
6. Call controller method : After getting the matching result from the routing table, you can call the corresponding controller method through reflection or other techniques.

Here is sample code for dynamically loading a class against a pretty URL:

// 注册自动加载器
spl_autoload_register(function ($name) {
    $path = 'path/to/classes';
    $filename = $path . '/' . $name . '.php';
    if (file_exists($filename)) {
        require $filename;
        return true;
    }
    return false;
});

// 使用路由表匹配 URL
$routes = [
    '/{resource}/foobar' => ['controller' => 'FoobarController', 'action' => 'index'],
    '/{resource}' => ['controller' => 'ResourceController', 'action' => 'show'],
];
$url = $_SERVER['REQUEST_URI'];
foreach ($routes as $pattern => $route) {
    if (preg_match($pattern, $url, $matches)) {
        $controller = $route['controller'];
        $action = $route['action'];
        break;
    }
}

// 调用控制器方法
if (isset($controller) && isset($action)) {
    $controller = new $controller;
    $controller->$action($matches);
} else {
    // Handle 404
}

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