protected function handleBuiltinConstantNode(ConstantNode $node) {
    $to_upper = $this->config['boolean_null_upper'];
    if ($to_upper) {
      $node->toUpperCase();
    }
    else {
      $node->toLowerCase();
    }
  }
protected function handleBuiltinConstantNode(ConstantNode $node) {
    $to_upper = $this->config['boolean_null_upper'];
    if ($to_upper) {
      $node->toUpperCase();
    }
    else {
      $node->toLowerCase();
    }
  }
protected function handleBuiltinConstantNode ( ConstantNode $ node ) { $ to_upper = $ this -> config [ 'boolean_null_upper' ] ; if ( $ to_upper ) { $ node -> toUpperCase ( ) ; } else { $ node -> toLowerCase ( ) ; } }
Handle formatting of constant node.

@param ConstantNode $node
true, false, or null node.
Handle formatting of constant node .