public ConditionInterface::condition($field, $value = NULL, $operator = NULL,$langcode= NULL)
Adds a condition.
string|\Drupal\Core\Entity\Query\ConditionInterface $field:
mixed $value:
string $operator:
string $langcode:
\Drupal\Core\Entity\Query\QueryInterface::condition()
public function condition($field, $value = NULL, $operator = NULL, $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!ConditionInterface.php/function/ConditionInterface::condition/8.1.x