phpcms 静态变量

class Counter {
    public static $count = 0;

    public static function increment() {
        self::$count++;
    }

    public static function getCount() {
        return self::$count;
    }
}

Counter::increment();
Counter::increment();
echo Counter::getCount(); // 输出 2

class Counter {
    public static $count = 0;
    private static $lock;

    public static function increment() {
        if (self::$lock === null) {
            self::$lock = new \Swoole\Lock(SWOOLE_MUTEX);
        }
        self::$lock->lock();
        self::$count++;
        self::$lock->unlock();
    }

    public static function getCount() {
        return self::$count;
    }
}

class Counter {
    private static $redis;

    public static function increment() {
        if (self::$redis === null) {
            self::$redis = new \Redis();
            self::$redis->connect('127.0.0.1', 6379);
        }
        self::$redis->incr('counter');
    }

    public static function getCount() {
        if (self::$redis === null) {
            self::$redis = new \Redis();
            self::$redis->connect('127.0.0.1', 6379);
        }
        return self::$redis->get('counter');
    }
}