php单例，实现redis/memcached

class RedisOperate
{
    private static $instance = null;
    //禁止new
    private function __construct(){}
    //禁止clone
    private function __clone(){}

    public static function getInstance()
    {
        if (!self::$instance instanceof self) {
            $host = $_SERVER['redis_host'];
            $port = $_SERVER['redis_port'];
            self::$instance = new \Redis();
            self::$instance->connect($host, $port);
        }
        return self::$instance;
    }
}

Memcached单例，实例：

class MemcacheOperate
{
    private static $instance = null;
    //禁止new
    private function __construct(){}
    //禁止clone
    private function __clone(){}

    public static function getInstance()
    {
        if (!self::$instance instanceof self) {
            $host = $_SERVER['memcache_host'];
            $port = $_SERVER['memcache_port'];
            self::$instance = new \Memcached();
            self::$instance->addServer($host, $port);
        }
        return self::$instance;
    }
}

client（使用）实例：

$_SERVER['redis_host'] = '127.0.0.1';
$_SERVER['redis_port'] = '6379';

RedisOperate::getInstance()->set('count', 0);
$redis_res = RedisOperate::getInstance()->incr('count');
var_dump($redis_res);

$_SERVER['memcache_host'] = '127.0.0.1';
$_SERVER['memcache_port'] = '11211';

MemcacheOperate::getInstance()->set('count', 0);
$mem_res = MemcacheOperate::getInstance()->increment('count',2);
var_dump($mem_res);