What are View Cells in CodeIgniter 4?
Why Interviewers Ask This
Mid-level CodeIgniter roles require deep understanding of this topic. Interviewers ask this to separate candidates who truly understand the mechanics from those who only know surface-level concepts.
Answer
View Cells in CI4 allow you to call a class method from within a view and insert its HTML output. They are reusable components that encapsulate both logic and a view. Define a cell class with a method that returns a view: namespace App\Cells; class RecentPosts { public function index(array $params = []): string { $posts = model("PostModel")->latest()->limit($params["count"] ?? 5)->findAll(); return view("cells/recent_posts", ["posts" => $posts]); } }. Call from a view: <?= view_cell("App\Cells\RecentPosts::index", ["count" => 3]) ?>. Cells can be cached: view_cell("App\Cells\RecentPosts::index", $params, 300) — cached for 300 seconds. View Cells are analogous to Laravel's View Components or Blade's @livewire — they encapsulate reusable view logic like sidebars, comment counts, and dynamic widgets.
Pro Tip
Demonstrate both theoretical understanding and practical experience. Say what it is, then give an example of how you actually used it in a CodeIgniter codebase.