CodeIgniter

CodeIgniter — lightweight PHP MVC framework with small footprint.

BackendModerate

Stack Components

FrameworkCodeIgniter 4.x

LanguagePHP 8

Why

Minimal configuration, fast execution, excellent documentation, near-zero bloat. Node.js, Go, and Python are the top 3 backend languages (Stack Overflow 2024).

Go's goroutines handle 100k+ concurrent connections per process; Node's event loop excels at I/O-bound workloads.

When

Use for small-to-medium PHP apps. Avoid for apps needing rich ecosystem like Laravel.

How

1. composer create-project codeigniter4/appstarter 2. Define controllers in app/Controllers 3. Configure routes 4. Serve with spark serve

Example

class Home extends BaseController { public function index() { return view('welcome_message'); } }

Common Problems

⚠Missing .env — copy env to .env and configure
⚠Routing not matching — check $routes definition order
⚠Configuration drift between environments — use infrastructure-as-code (Terraform/Pulumi) to keep dev/staging/prod identical

Best Practices

✓Use CodeIgniter Shield for authentication
✓Leverage Sparks for CLI commands
✓Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit

FAQ

What is CodeIgniter and what projects is it for?

CodeIgniter — lightweight PHP MVC framework with small footprint. It pairs layered technologies for end-to-end type safety and out-of-the-box deploys, fitting everything from MVPs to production SaaS.

How do I spin up a working demo with CodeIgniter in 10 minutes?

Two steps: (1) composer create-project codeigniter4/appstarter; (2) Define controllers in app/Controllers. Get the local dev server running, then wire one real data source to verify the end-to-end loop.

What is the most common pitfall with CodeIgniter and how do I avoid it?

The most common pitfall is: Missing .env — copy env to .env and configure. Avoid it by adding the matching checklist to your PR template and running type-check + lint + unit tests in CI — three gates before merge.

What are the best practices for CodeIgniter?

Best practices for CodeIgniter include: Use CodeIgniter Shield for authentication; Leverage Sparks for CLI commands; Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit. The first one — "Use CodeIgniter Shield for authentication" — should be set up at project init to avoid costly rework later.

When should I NOT choose CodeIgniter?

Pick something else in three cases: (1) the team has zero experience with the core framework and the deadline is tight (learning-curve risk); (2) it's a pure content/marketing site (Astro is lighter); (3) you need very high throughput (>10k RPS) or strict-consistency microservices (Go/Rust). CodeIgniter shines for mid-to-high complexity full-stack and API work — don't over-engineer simple static pages with it.