Technical reference

PHP Cheatsheet

Server-side scripting for the web

Getting Started

bash

Install via Composer

Create a new Laravel project and start the development server.

composer create-project laravel/laravel example-app
cd example-app
php artisan serve

bash

Sail Setup (Linux/macOS)

Install Laravel with Docker using Sail.

curl -s https://laravel.build/example-app | bash
cd example-app
./vendor/bin/sail up

note

Access App

Default local development URL.

http://localhost

Environment & Config

php

Access .env Values

Get environment variables with optional default.

env('APP_DEBUG');
env('APP_DEBUG', false);

App Environment

Get current app environment.

use Illuminate\Support\Facades\App;

$env = App::environment();

Config Access

Access config values with optional fallback.

config('app.timezone');
config('app.timezone', 'UTC');

Routing

Basic Route

Simple GET route using closure.

Route::get('/hello', function () {
  return 'Hello World';
});

Controller Route

Define route with controller method.

Route::get('/user', [UserController::class, 'index']);

Named Route

Create a named route for reuse.

Route::get('/profile', function () {
  // ...
})->name('profile');

Route Parameters

Required Param

Capture route parameters from URI.

Route::get('/user/{id}', function ($id) {
  return $id;
});

Optional Param

Make a route parameter optional.

Route::get('/user/{name?}', function ($name = 'Guest') {
  return $name;
});

Middleware & Groups

Middleware Group

Apply middleware to multiple routes.

Route::middleware(['auth'])->group(function () {
  Route::get('/dashboard', function () {
    return 'Dashboard';
  });
});

Route Prefix

Group routes under a common URL prefix.

Route::prefix('admin')->group(function () {
  Route::get('/users', function () {
    return 'Admin Users';
  });
});

Blade Templates

Echo Output

Display data in Blade templates.

<h1>Hello, {{ $name }}</h1>

If Statement

Conditional logic in Blade.

@if($count > 0)
  Count: {{ $count }}
@endif

Loop Example

Iterate over arrays or collections.

@foreach ($users as $user)
  {{ $user->name }}
@endforeach

Controllers

Basic Controller

Basic Laravel controller example.

class UserController extends Controller {
  public function show($id) {
    return view('user.profile', ['user' => User::find($id)]);
  }
}

Route to Controller

Route mapped to controller method.

Route::get('/user/{id}', [UserController::class, 'show']);

Requests

blade

CSRF Token

Protect forms from CSRF attacks.

<form method="POST" action="/profile">
  @csrf
  ...
</form>

Access Request Data

Read input from form submissions.

$name = $request->input('name');

Old Input

Repopulate form inputs after validation error.

<input value="{{ old('email') }}" />

Validation

Validate Request

Validate incoming request data.

$request->validate([
  'title' => 'required|max:255',
  'body' => 'required',
]);

blade

Validation Errors

Display validation errors in Blade.

@if ($errors->any())
  <ul>
    @foreach ($errors->all() as $error)
      <li>{{ $error }}</li>
    @endforeach
  </ul>
@endif

Commands

Run Dev Server

Start Laravel dev server at http://localhost:8000

php artisan serve

Clear Cache

Clear all Laravel caches.

php artisan config:clear
php artisan route:clear
php artisan view:clear

Migrate DB

Run the database migrations.

php artisan migrate