How can PHP developers implement a system similar to Smarty for modular usage of components within their projects?

PHP developers can implement a system similar to Smarty for modular usage of components within their projects by creating a template engine that separates the presentation logic from the business logic. This can be achieved by creating reusable template files that contain placeholders for dynamic content and using a parser to replace these placeholders with actual data. By following this approach, developers can achieve better code organization, maintainability, and reusability in their projects.

// Example of a simple template engine implementation in PHP
class TemplateEngine {
    private $template;

    public function __construct($template) {
        $this->template = $template;
    }

    public function render($data) {
        foreach ($data as $key => $value) {
            $this->template = str_replace("{{" . $key . "}}", $value, $this->template);
        }
        return $this->template;
    }
}

// Example usage
$template = new TemplateEngine("<h1>Hello, {{name}}!</h1>");
$data = ["name" => "John Doe"];
echo $template->render($data);