How does PHP react when critical business logic is executed before the HTML output is sent to the browser in an MVC application?

When critical business logic is executed before the HTML output is sent to the browser in an MVC application, it can cause issues such as headers already sent errors or unexpected behavior on the webpage. To solve this problem, it is important to separate the business logic from the view rendering process. This can be achieved by following the MVC design pattern where the controller handles the business logic and the view handles the presentation of data. 

// Controller
class Controller {
    public function processRequest() {
        // Business logic goes here
        $data = $this->getData();
        
        // Render view
        $view = new View();
        $view->render($data);
    }

    private function getData() {
        // Perform business logic operations
        return $data;
    }
}

// View
class View {
    public function render($data) {
        // HTML output goes here
        echo "<html><body>";
        // Output data to the webpage
        echo "<h1>Hello, " . $data['name'] . "</h1>";
        echo "</body></html>";
    }
}

// Instantiate controller and process request
$controller = new Controller();
$controller->processRequest();

Keywords

PHP MVC business logic output buffering headers

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