1. 在宝塔环境下可直接进行安装
2. 安装完成后需要进入指定的php环境下进行安装memcached扩展
3. 在thinkphp下进行自定义封装Memcached类

<?php
namespace app\lib\cache;

// 封装memcached类
use think\Config;


class Memcached
{
    private static $_instance = null;

    public function __construct()
    {
        return self::getInstance();
    }

    public static function getInstance()
    {
        $option = [
            'host' => Config::get('cache.memcached_host') ?? '127.0.0.1',
            'port' => Config::get('cache.memcached_port') ?? 11211,
        ];
        if (is_null(self::$_instance)) {
            self::$_instance = new \Memcached();
            self::$_instance->addServer($option['host'], $option['port']);
        }
        return self::$_instance;
    }


    /**
     * @param $key 键
     * @param $value 值
     * @param int $expire 有效期
     * @return bool
     */
    public static function set($key, $value, $expire = 0)
    {
        return self::getInstance()->set($key, $value, $expire);
    }

    /**
     * 查询缓存值，单个或数组
     * @param $key 键
     * @return mixed
     */
    public static function get($key)
    {
        $func = is_array($key) ? 'getMulti' : 'get';
        return self::getInstance()->{$func}($key);
    }

    /**
     * 自增
     * @param $key
     * @param int $number
     * @return bool
     */
    public static function incr($key, $number = 1)
    {
        return self::getInstance()->increment($key, $number);
    }

    /**
     * 自减
     * @param $key
     * @param int $number
     * @return int
     */
    public static function decr($key, $number = 1)
    {
        return self::getInstance()->decrement($key,$number);
    }

    /**
     * 删除
     * @param $key
     * @return bool
     */
    public static function delete($key){
        return self::getInstance()->delete($key);
    }

}