Tengo una cadena JSON que se parece a esto:

{"addresses":{"address":[{"@array":"true","@id":"888888","@uri":"xyz","household":{"@id":"44444","@uri":"xyz"},"person":{"@id":"","@uri":""},"addressType":{"@id":"1","@uri":"xyz","name":"Primary"},"address1":"xyz","address2":null,"address3":null,"city":"xyz","postalCode":"111111"}]}}

¿Cuál sería el PHP para decodificar esto y colocarlo?address1, address2, address3, cityypostalCode en variables de sesión?

Hasta ahora he intentado esto pero no está funcionando:

$results = json_decode(strstr($address, '{"addresses":{"address":[{'), true);
$_SESSION['address1'] = $results['address']['address1'];

¡Gracias!