‘Drupal 8 Creating custom module steps

Costume Module file structure (My Drupal version 8.1.2)

1. Create a folder under ‘/modules/’ for this explanation I am creating a ‘example’ (this is our module folder) folder inside module folder

2. Create module info file ‘example.info.yml’ inside example folder

name: Drupal 8 custom module example
type: module
description: 'Example for Drupal 8 modules.'
package: Custom
version: 8.x
core: 8.x

3. Create example.module inside example folder

<?php
/**
 * @File
 * Example custom module for Drupal 8.
 */
 
/**
 * Implementing hook_menu().
 */
function example_menu() {
  // The paths '/examp' should be same in example.routing.yml.
  $items['/examp'] = array(
    'title' => 'Example page',
    'description' => 'This is a example page from example module.',
    // The name of the route from example.routing.yml
    'route' => 'example.my_page',
  );
  return $items;
}

4. Create example.routing.yml in example folder

example.my_page:
  path: '/examp'
  defaults:
    _controller: '\Drupal\example\Controller\ExampleController::myPage'
    _title: 'My first page in Drupal8'
  requirements: 
    _permission: 'access content'

The path: ‘/examp’ begin with 2 space catheters. Here we are defining the end point (http://localhost/examp [ I am using ‘localhost’ for development])

5. Create controller:- for creating controller first we need to create an ‘src’ folder inside example folder inside src folder create a ‘Controller’ folder and inside it create ExampleController.php

the controller full path will be like this ‘modules/example/src/Controller/ExampleController.php’

<?php
/**
 * @file
 */

namespace Drupal\example\Controller;

/**
 * Route responses for the Example module.
 */
class ExampleController {
  /**
   * Returns a simple page.
   *
   * @return array
   *   A simple renderable array.
   */
  public function myPage() {
    $element = array(
      '#markup' => 'Hello world!',
    );
    return $element;
  }
}
?>

6. Install the new module from admin

7. Open your favorite internet browser  hit your example URL (in my case :  http://localhost/examp) you can see the generated page

GitHub : https://github.com/bikeshm/drupal-8-module-sample1

Check how to create a custom block : https://wiki.workassis.com/drupal-8-creating-custom-block-from-scratch/