php5 syntax

node/argument.go

@@ -4,14 +4,16 @@ import "github.com/z7zmey/php-parser/walker"
 
 // Argument node
 type Argument struct {
-	Variadic bool // if ... before variable
-	Expr     Node // Exression
+	Variadic    bool // if ... before variable
+	IsReference bool // if & before variable
+	Expr        Node // Exression
 }
 
 // NewArgument node constuctor
-func NewArgument(Expression Node, Variadic bool) *Argument {
+func NewArgument(Expression Node, Variadic bool, IsReference bool) *Argument {
 	return &Argument{
 		Variadic,
+		IsReference,
 		Expression,
 	}
 }
@@ -19,7 +21,8 @@ func NewArgument(Expression Node, Variadic bool) *Argument {
 // Attributes returns node attributes as map
 func (n *Argument) Attributes() map[string]interface{} {
 	return map[string]interface{}{
-		"Variadic": n.Variadic,
+		"Variadic":    n.Variadic,
+		"IsReference": n.IsReference,
 	}
 }