PHP JSON Decode

I have long php variable after decoding JSON string using json_decode function.

object(stdClass)#1 (3) {
["responseData"]=>
object(stdClass)#2 (2) {
["results"]=>
array(4) {
[0]=>
object(stdClass)#3 (8) {
["GsearchResultClass"]=>
string(10) "GwebSearch"
["unescapedUrl"]=>
string(32) "http://www.example.com/Home/"........

What should be the php syntax to access highlighted portion of string/array.

i want to access value of this variable ["unescapedUrl"]

Please help.

 

$unescapedurl = $variable->responseData->results[0]->unescapedUrl;