value pair node. * * @param string|Node\Identifier $key Key * @param Node\Expr $value Value * @param array $attributes Additional attributes */ public function __construct($key, Node\Expr $value, array $attributes = array()) { parent::__construct($attributes); $this->key = \is_string($key) ? new Node\Identifier($key) : $key; $this->value = $value; } public function getSubNodeNames() { return array('key', 'value'); } }