When tp5 cache driver Predis php does not have a Redis driver module, use Predis to connect and use redis.

composer require predis/predis

<?phpnamespace think\cache\driver;use think\cache\Driver;/**
 * Predis缓存驱动,就是php没有redis扩展的时候使用，适合单机部署、有前端代理实现高可用的场景，性能最好
 * 有需要在业务层实现读写分离、或者使用RedisCluster的需求，请使用Redisd驱动
 *
 * 要求安装Predis扩展：https://github.com/nrk/predis
 * 
 */class Predis extends Driver{
    protected $options = [        &#39;scheme&#39;     => &#39;tcp&#39;,        &#39;host&#39;       => &#39;127.0.0.1&#39;,        &#39;port&#39;       => 6379,        &#39;password&#39;   => &#39;&#39;,        &#39;select&#39;     => 0,        &#39;timeout&#39;    => 0,        &#39;expire&#39;     => 0,        &#39;persistent&#39; => false,        &#39;prefix&#39;     => &#39;&#39;,        &#39;database&#39;   => 15,
    ];    
    /**
     * 构造函数
     * @param array $options 缓存参数
     * @access public
     */
    public function __construct($options = [])
    {
        if (!empty($options)) {            
        $this->options = array_merge($this->options, $options);
        }        $func          = $this->options[&#39;persistent&#39;] ? &#39;pconnect&#39; : &#39;connect&#39;;        
        $this->handler = new \Predis\Client;        
        $this->handler->$func($this->options[&#39;host&#39;], $this->options[&#39;port&#39;], $this->options[&#39;timeout&#39;]);        
        if (&#39;&#39; != $this->options[&#39;password&#39;]) {            
        $this->handler->auth($this->options[&#39;password&#39;]);
        }        
        if (0 != $this->options[&#39;select&#39;]) {            
        $this->handler->select($this->options[&#39;select&#39;]);
        }
    }    /**
     * 判断缓存
     * @access public
     * @param string $name 缓存变量名
     * @return bool
     */
    public function has($name)
    {
        return $this->handler->get($this->getCacheKey($name)) ? true : false;
    }    /**
     * 读取缓存
     * @access public
     * @param string $name 缓存变量名
     * @param mixed  $default 默认值
     * @return mixed
     */
    public function get($name, $default = false)
    {
        $value = $this->handler->get($this->getCacheKey($name));        
        if (is_null($value)) {            
        return $default;
        }        
        $jsonData = json_decode($value, true);        // 检测是否为JSON数据 true 返回JSON解析数组, false返回源数据 byron sampson<xiaobo.sun@qq.com>
        return (null === $jsonData) ? $value : $jsonData;
    }    /**
     * 写入缓存
     * @access public
     * @param string    $name 缓存变量名
     * @param mixed     $value  存储数据
     * @param integer   $expire  有效时间（秒）
     * @return boolean
     */
    public function set($name, $value, $expire = null)
    {
        if (is_null($expire)) {            
        $expire = $this->options[&#39;expire&#39;];
        }        
        if ($this->tag && !$this->has($name)) {            
        $first = true;
        }        
        $key = $this->getCacheKey($name);        //对数组/对象数据进行缓存处理，保证数据完整性  byron sampson<xiaobo.sun@qq.com>
        $value = (is_object($value) || is_array($value)) ? json_encode($value) : $value;        
        if (is_int($expire) && $expire) {            
        $result = $this->handler->setex($key, $expire, $value);
        } else {            
        $result = $this->handler->set($key, $value);
        }        
        isset($first) && $this->setTagItem($key);        
        return $result;
    }    /**
     * 自增缓存（针对数值缓存）
     * @access public
     * @param string    $name 缓存变量名
     * @param int       $step 步长
     * @return false|int
     */
    public function inc($name, $step = 1)
    {
        $key = $this->getCacheKey($name);        
        return $this->handler->incrby($key, $step);
    }    /**
     * 自减缓存（针对数值缓存）
     * @access public
     * @param string    $name 缓存变量名
     * @param int       $step 步长
     * @return false|int
     */
    public function dec($name, $step = 1)
    {
        $key = $this->getCacheKey($name);        
        return $this->handler->decrby($key, $step);
    }    /**
     * 删除缓存
     * @access public
     * @param string $name 缓存变量名
     * @return boolean
     */
    public function rm($name)
    {
        return $this->handler->delete($this->getCacheKey($name));
    }    /**
     * 清除缓存
     * @access public
     * @param string $tag 标签名
     * @return boolean
     */
    public function clear($tag = null)
    {
        if ($tag) {            // 指定标签清除
            $keys = $this->getTagItem($tag);            
            foreach ($keys as $key) {                
            $this->handler->delete($key);
            }            
            $this->rm(&#39;tag_&#39; . md5($tag));            
            return true;
        }        
        return $this->handler->flushDB();
    }

}