Tutorials - Drupal

Like Drupal 7, you can use check_markup();

CAUTION : This must only use on a rendered HTML page

file_move(FileInterface $source, $destination = NULL, $replace = FILE_EXISTS_RENAME)

Example:

$file = \Drupal\file\Entity\File::load($fid);

file_move(FileInterface $source, 'path/to/destination');

The easiest way is use html default progress bar like:

<progress value='$percentage' max='100'></progress>

And theme with CSS.

Get the image file src (url)   

    $fid = 1;//The file ID   

    $file = \Drupal\file\Entity\File::load($fid);

    $path = $file->getFileUri();



Equivalent syntax Drupal 7 -> Drupal 8

For this, You must use hook_entity_delete.



Example :

function mymodule_entity_delete(\Drupal\Core\Entity\EntityInterface $entity) {

  $entity_type = $entity->getEntityTypeId();

  $entity_id = $entity->id();



Example: 

Change on a form or controller

Just set ['#title'] element.

Form Example : $form['#title'] = "The title";

Example:

$user = User::load($uid);

user_login_finalize($user);

Get All roles:

    $roles = \Drupal\user\Entity\Role::loadMultiple();