public SelectExtender::__clone()
Clone magic method.
Select queries have dependent objects that must be deep-cloned. The connection object itself, however, should not be cloned as that would duplicate the connection itself.
Overrides SelectInterface::__clone
public function __clone() { $this->uniqueIdentifier = uniqid('', TRUE); // We need to deep-clone the query we're wrapping, which in turn may // deep-clone other objects. Exciting! $this->query = clone($this->query); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!SelectExtender.php/function/SelectExtender::__clone/8.1.x