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Entity label callbacks now receive $entity_type as first parameter

Project: 

Drupal core

Introduced in branch: 

8.x

Introduced in version: 

8.x-UNSTABLE1

Issues: 
entity_label() is not passing along the $entity_type parameter
Description: 

Any label callback defined in an entity now receives two arguments: $entity_type and $entity. This allows label callbacks that apply to multiple entity types.
In Drupal 7.2 and up, you can also use the added $entity_type parameter. Note that for backwards compatibility with Drupal 7.0 the parameter order is reversed.

Example:

<?php
function example_entity_info() {
  ...
  $entities['example']['label callback'] = 'example_label';
  return $entities;
}

// Drupal 7.0 and up:
function example_label($entity) {
  ...
}

// Drupal 7.2 and up:
function example_label($entity, $entity_type) {
  ...
}

// Drupal 8.x:
function example_label($entity_type, $entity) {
  ...
}
?>