/**
* Constructs a function call argument node.
*
* @param Expr $value Value to pass
* @param bool $byRef Whether to pass by ref
* @param bool $unpack Whether to unpack the argument
* @param array $attributes Additional attributes
*/
public function __construct(Expr $value, $byRef = false, $unpack = false, array $attributes = array())
{
parent::__construct($attributes);
$this->value = $value;
$this->byRef = $byRef;
$this->unpack = $unpack;
}