Json Decode Google Api

[k.b]

Non usare un indice numerico, ma cerca il valore "locality":

$data = json_decode($json);
$locality = '';

foreach ( $data->results[0]->address_components as $entry ) {
    if ( in_array('locality', $entry->types) ) {
        $locality = $entry->short_name;
        break;
    }
}

echo $locality;