How to extract data from a simple API Response?

I received an api response from the endpoint:

http://rest.sharethis.com/reach/getUrlInfo.php?url='http://www.mydomain.com/'

{ "email" : { "inbound" : 47498,
      "outbound" : "27459"
    },
  "facebook" : { "inbound" : 6311,
      "outbound" : "2301"
    },
  "other" : { "inbound" : 2196,
      "开发者_开发技巧outbound" : "1456"
    },
  "sharethis" : { "inbound" : 16536,
      "outbound" : "7746"
    },
  "total" : { "inbound" : 80399,
      "outbound" : "40956"
    },
  "twitter" : { "inbound" : 4946,
      "outbound" : "1298"
    }
}

How can i get the sum of 'inbound + outbound' of the "total" variable into a string like $total for echoing out in php.

$decoded = json_decode($string);
$inbound = $decoded->total->inbound;
$outbound = $decoded->total->outbound;
echo "Total: ".($inbound+$outbound);

That appears to be JSON. You should check out json_decode(), which will turn your string into a PHP array that can be easily manipulated in the standard ways.