I have tried the instructions available in the internet and none of them worked for me. The setup: the printer (Canon E600) is connected via USB on wireless router (ASUS WL-520gU) and Mac is running OS X El Capitan 10.11.6.

The following are the instructions:

1. Click the Apple button at the upper left and select System Preferences from the menu.

In Drupal 7, adding external javascript library available to all pages with query string value came either from PHP computed value or from database this can be done by:

  
/**
 * Implements hook_init()
 */
function mymodule_init() {
  drupal_add_js('//maps.googleapis.com/maps/api/js?key=' . variable_get('mymodule_google_map_api_key', NULL), 'external');
}
  

For Drupal 8 this is possible by:

The MaxMind GeoIP2 binary database is a custom binary format and there are two available APIs that read this binary database: MaxMind DB Reader PHP API which includes an optional C extension that you may install to improve binary database lookup performance and the default is GeoIP2 PHP API. We will discuss how to install these two APIs in your system.

Most of us pass data from PHP to javascript variable available to all pages in Drupal 7 is by:

  
/**
 * Implements hook_init()
 */
function mymodule_init() {
  $computed_data = mymodule_get_data();
  drupal_add_js(array('mymodule_computed_data' => $computed_data), 'setting');
}
  

We can access this data in javascript by:

Drupal uses an externally-maintained repository the https://packagist.drupal-composer.org but this repo is scheduled to be deprecated in January 2017 by then we will be using https://packages.drupal.org/8 repo URL.

It is assumed that composer is already installed in your system. Make sure your composer version is 1.0.0 or higher, to check execute:

  
composer -V
  

If it is lower than version 1.0.0, update it by:

  
composer self-update
  

Change directory to your Drupal root path.

Using Smart IP's data source IP2Location binary database requires ip2location/ip2location-php library which contains API that reads its database file. This article will show how to setup this API using composer.

The following procedures are tested on my Linode server running Centos 7 64-bit Linux distribution.

1. First we will install composer:

Here are code snippets of creating internal and external links in Drupal 8 having query, fragment identifier (named anchor) and class attribute.

In Drupal 7, we can read the current user's custom data by:

  
global $user;
$user_obj = user_load($user->uid);
print_r($user_obj->data);
  

... and write by:

  
global $user;
$user_obj = user_load($user->uid);
user_save($user_obj, array('data' => array('key' => $value)));
  

Now in Drupal 8, we can read the current user's custom data by: