Template::getVariables() 

\nn\t3::Template()->getVariables($view); 

Retrieves the variables of the current view, i.e: Everything that was set via assign() and assignMultiple().

In the ViewHelper:

\nn\t3::Template()->getVariables( $renderingContext );
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In the controller:

\nn\t3::Template()->getVariables( $this->view );
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| @return array

Source Code 

public function getVariables( &$view )
{
	$context = $view;
	if (method_exists($context, 'getRenderingContext')) {
		$context = $view->getRenderingContext();
	}
	return $context->getVariableProvider()->getSource() ?: [];
}
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