public EntityListBuilder::buildHeader()
Builds the header row for the entity listing.
array A render array structure of header strings.
\Drupal\Core\Entity\EntityListBuilder::render()
public function buildHeader() { $row['operations'] = $this->t('Operations'); return $row; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityListBuilder.php/function/EntityListBuilder::buildHeader/8.1.x