Novice

The ping command

Ping is a command line network utility tool to test network connectivity. ​It tests the connection between a sender and a receiver node. It reports whether the receiver node responds by sending an echo request. The receiving node responds with an echo reply.

Ping simply sends a signal to another computer and waits for a response.

**
 * Implements hook_install().
 */
function MY_MODULE_install() {
	
  // Set module weight in order to invoke module after other modules.
  db_update('system')
  ->fields(array('weight' => 100))
  ->condition('name', 'MY_MODULE')
  ->execute();
}

Hook_process_field can be used inside template.php to render only one image on a multiple image field.

/**
 * Create and process a new Countdown object.
 * 
 * @param seconds
 *  Integer
 */
function Countdown(seconds) {
	
	$('#timer').html(seconds);
	
	var timer = window.setInterval(function() {
	  if (seconds === 0) {
        clearInterval(timer);
        return;
	  }
      seconds -= 1;
      $('#timer').html(seconds);
	}, 1000);
	
	this.stop = function() {
      clearInterval(timer);
	}
	
}

/**
 * A Timer object.
 */
function Timer() {
	
	var time = 0;
	$('#timer').html(time);
	
	var timer = window.setInterval(function() {
      time += 1;
      $('#timer').html(time);
	}, 1000);
	
	this.stop = function() {
      clearInterval(timer);
      $('#timer').html(time);
	}
	
}

// Does the browser support geolocation?
// @see http://www.w3schools.com/html/html5_geolocation.asp.
if(navigator.geolocation) {
	// When clicked on deny, error function is triggered.
	navigator.geolocation.getCurrentPosition(success,error);
} else {
	console.log('Browser doesn\'t support geolocation, default geolocation unsupported action.');
}

function success(pos) {
	console.log('User allows, location specific action.');
}
function error(error) {
	console.log('User denies, default geolocation supported action.');
}

/**
 * Implements hook_menu().
 */
function export_mails_menu() {
  return array(
    'export_mails.csv' => array(
      'page callback' => '_export_mails',
      'access callback' => 'user_is_logged_in',
    ),
  );
}

/**
 * Implements hook_block_info().
 */
function export_mails_block_info() {

  $blocks['export_mails'] = array(
    'info' => t('Export mails'),
  );

  return $blocks;

}

/**
 * Implements hook_block_view().
 */
function export_mails_block_view($delta) {
  switch ($delta) {
    case 'export_mails' :
      return array(

​Basic creation of a content type in Drupal 8. Content type is created in code in a custom module called dribbit_create_content_type.