Method sanityCheckSystemVariables

/**
 * Ensure several core system input variables are not arrays.
 *
 * @return  void
 *
 * @since   3.9
 */
private function sanityCheckSystemVariables()
{
    $input = $this->input;
    // Get invalid input variables
    $invalidInputVariables = array_filter(array('option', 'view', 'format', 'lang', 'Itemid', 'template', 'templateStyle', 'task'), function ($systemVariable) use($input) {
        return $input->exists($systemVariable) && is_array($input->getRaw($systemVariable));
    });
    // Unset invalid system variables
    foreach ($invalidInputVariables as $systemVariable) {
        $input->set($systemVariable, null);
    }
    // Abort when there are invalid variables
    if ($invalidInputVariables) {
        throw new \RuntimeException('Invalid input, aborting application.');
    }
}