How to use Redis in php?

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I installed redis 2.8.12 and configured phpredis. Then I called redis instance in php class. But there is no result, can you help me?

public function __construct() {

        try {
            echo ':) ';
            $newRedis = new Redis();
            echo ':P ';
        }
        catch (Exception $e) {
            echo $e -> getMessage();
        }



    }

this printed :), not printed :P

asked 11 secs ago

user2789934

38