Memcache.php
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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace think\cache\driver;
use think\cache\Driver;
class Memcache extends Driver
{
protected $options = [
'host' => '127.0.0.1',
'port' => 11211,
'expire' => 0,
'timeout' => 0, // 超时时间（单位：毫秒）
'persistent' => true,
'prefix' => '',
];
/**
* 构造函数
* @param array $options 缓存参数
* @access public
* @throws \BadFunctionCallException
*/
public function __construct($options = [])
{
if (!extension_loaded('memcache')) {
throw new \BadFunctionCallException('not support: memcache');
}
if (!empty($options)) {
$this->options = array_merge($this->options, $options);
}
$this->handler = new \Memcache;
// 支持集群
$hosts = explode(',', $this->options['host']);
$ports = explode(',', $this->options['port']);
if (empty($ports[0])) {
$ports[0] = 11211;
}
// 建立连接
foreach ((array) $hosts as $i => $host) {
$port = isset($ports[$i]) ? $ports[$i] : $ports[0];
$this->options['timeout'] > 0 ?
$this->handler->addServer($host, $port, $this->options['persistent'], 1, $this->options['timeout']) :
$this->handler->addServer($host, $port, $this->options['persistent'], 1);
}
}
/**
* 判断缓存
* @access public
* @param string $name 缓存变量名
* @return bool
*/
public function has($name)
{
$key = $this->getCacheKey($name);
return false !== $this->handler->get($key);
}
/**
* 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)
{
$result = $this->handler->get($this->getCacheKey($name));
return false !== $result ? $result : $default;
}
/**
* 写入缓存
* @access public
* @param string $name 缓存变量名
* @param mixed $value 存储数据
* @param integer|\DateTime $expire 有效时间（秒）
* @return bool
*/
public function set($name, $value, $expire = null)
{
if (is_null($expire)) {
$expire = $this->options['expire'];
}
if ($expire instanceof \DateTime) {
$expire = $expire->getTimestamp() - time();
}
if ($this->tag && !$this->has($name)) {
$first = true;
}
$key = $this->getCacheKey($name);
if ($this->handler->set($key, $value, 0, $expire)) {
isset($first) && $this->setTagItem($key);
return true;
}
return false;
}
/**
* 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);
if ($this->handler->get($key)) {
return $this->handler->increment($key, $step);
}
return $this->handler->set($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);
$value = $this->handler->get($key) - $step;
$res = $this->handler->set($key, $value);
if (!$res) {
return false;
} else {
return $value;
}
}
/**
* 删除缓存
* @param string $name 缓存变量名
* @param bool|false $ttl
* @return bool
*/
public function rm($name, $ttl = false)
{
$key = $this->getCacheKey($name);
return false === $ttl ?
$this->handler->delete($key) :
$this->handler->delete($key, $ttl);
}
/**
* 清除缓存
* @access public
* @param string $tag 标签名
* @return bool
*/
public function clear($tag = null)
{
if ($tag) {
// 指定标签清除
$keys = $this->getTagItem($tag);
foreach ($keys as $key) {
$this->handler->delete($key);
}
$this->rm('tag_' . md5($tag));
return true;
}
return $this->handler->flush();
}
}