Why quote it at all? I can't imagine the Google API requires (or even expects) that value to be quoted.
$json_url = file_get_contents('http://maps.google.com/maps/api/geocode/json?address=jaipur&sensor=false'); //line 9
Or, is jaipur a variable? If so:
$json_url = file_get_contents("http://maps.google.com/maps/api/geocode/json?address=$jaipur&sensor=false"); //line 9
Hard to tell from your question what it is you're trying to accomplish...