[refactoring] keep $ in variable identifier

pkg/printer/printer.go

@@ -1,10 +1,11 @@
 package printer
 
 import (
-	"github.com/z7zmey/php-parser/pkg/ast"
-	"github.com/z7zmey/php-parser/pkg/token"
 	"io"
 	"strings"
+
+	"github.com/z7zmey/php-parser/pkg/ast"
+	"github.com/z7zmey/php-parser/pkg/token"
 )
 
 type printerState int
@@ -1860,7 +1861,7 @@ func (p *Printer) printExprVariable(n ast.Vertex) {
 	p.printFreeFloating(nn, token.Start)
 
 	p.printFreeFloating(nn, token.Dollar)
-	if nn.GetNode().Tokens.IsEmpty() {
+	if _, ok := nn.VarName.(*ast.Identifier); !ok {
 		io.WriteString(p.w, "$")
 	}
 

pkg/printer/printer_parsed_php5_test.go

@@ -1084,7 +1084,7 @@ func TestParseAndPrintPhp5Shebang(t *testing.T) {
 	<?php
 	$a;?>test<? `
 
-	actual := print(parse(src))
+	actual := printPhp5(parsePhp5(src))
 
 	if src != actual {
 		t.Errorf("\nexpected: %s\ngot: %s\n", src, actual)