Redis Client (Predis). Keys that Expires.

Redis.php

<?php

class Redis {
    private static $handler = NULL;

    private static function getHandler()
    {
        if (self::$handler)
            return self::$handler;

        self::$handler = new Predis\Client();

        return self::$handler;
    }

    public static function __callStatic($name, $args)
    {
        $callback = array(self::getHandler(), $name);
        return call_user_func_array($callback, $args);
    }
}

?>

setkey.php

<?php

$minutes_to_expire = 5;
$key = "namespace:key";

if (!Redis::get($key)) {
    Redis::set($key, "value");
}

Redis::expire($key, ($minutes_to_expire * 60));

?>