Use the Visitor Design Pattern | PHP Code Examples in 2023
Using the Visitor Design Pattern in PHP The visitor pattern is a behavioral pattern that separates algorithms from the objects it operates on. This distinction helps minimize changes to the existing system and conveniently introduces new behaviors or variants of behavior to the system. Article Highlights Visitor pattern helps in the separation of concerns between behaviors (algorithms) and objects they act on. Benefit - Add additional behaviors (algorithms) to a complex composite without changing it. Con - A visitor class is coupled to the base classes it operates on. Use when you need to separate the business and presentational layers in an application. <?php interface Visitor { public function menuInfo($menu); public function menuItemInfi($menuItem); } class NutrientInfoVisitor implements Visitor { //Expects Menu object public function menuInfo($menu) { /* Iterate through menu items and provide information on every menu item. */ } //Expects MenuItem object. public function menuItemInfo($menuItem) { /* Provide nutrient…
