Mastering PHP 7

Updating 

Updating a value via the Redis client is the same as inserting it. We use the same set() method, with the same key. The new value simply overwrites the previous one, if any exists:

<?phptry {    $client = new Redis();    $client->connect('localhost', 6379);    $client->set('test', 'test1');    $client->set('test', 'test2');    // $client->get('test');    // returns string containing "test2" chars} catch (RedisException $e) {    echo $e->getMessage(), PHP_EOL;}