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<?php $foo = ['view_builder' => NULL]; $foo+= array( 'storage' => 'Drupal\Core\Entity\Sql\SqlContentEntityStorage', 'view_builder' => 'Drupal\Core\Entity\EntityViewBuilder', ); var_dump($foo);
Output for 5.5.0 - 7.3.0rc4
array(2) { ["view_builder"]=> NULL ["storage"]=> string(46) "Drupal\Core\Entity\Sql\SqlContentEntityStorage" }