public FormBase::setRequestStack(RequestStack $request_stack)
Sets the request stack object to use.
\Symfony\Component\HttpFoundation\RequestStack $request_stack: The request stack object.
$this
public function setRequestStack(RequestStack $request_stack) {
$this->requestStack = $request_stack;
return $this;
}
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormBase.php/function/FormBase::setRequestStack/8.1.x