Lite.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;
/**
* 文件类型缓存类
* @author liu21st <liu21st@gmail.com>
*/
class Lite extends Driver
{
protected $options = [
'prefix' => '',
'path' => '',
'expire' => 0, // 等于 10*365*24*3600（10年）
];
/**
* 构造函数
* @access public
*
* @param array $options
*/
public function __construct($options = [])
{
if (!empty($options)) {
$this->options = array_merge($this->options, $options);
}
if (substr($this->options['path'], -1) != DS) {
$this->options['path'] .= DS;
}
}
/**
* 取得变量的存储文件名
* @access protected
* @param string $name 缓存变量名
* @return string
*/
protected function getCacheKey($name)
{
return $this->options['path'] . $this->options['prefix'] . md5($name) . '.php';
}
/**
* 判断缓存是否存在
* @access public
* @param string $name 缓存变量名
* @return mixed
*/
public function has($name)
{
return $this->get($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)
{
$filename = $this->getCacheKey($name);
if (is_file($filename)) {
// 判断是否过期
$mtime = filemtime($filename);
if ($mtime < time()) {
// 清除已经过期的文件
unlink($filename);
return $default;
}
return include $filename;
} else {
return $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();
} else {
$expire = 0 === $expire ? 10 * 365 * 24 * 3600 : $expire;
$expire = time() + $expire;
}
$filename = $this->getCacheKey($name);
if ($this->tag && !is_file($filename)) {
$first = true;
}
$ret = file_put_contents($filename, ("<?php return " . var_export($value, true) . ";"));
// 通过设置修改时间实现有效期
if ($ret) {
isset($first) && $this->setTagItem($filename);
touch($filename, $expire);
}
return $ret;
}
/**
* 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, $step = 1)
{
if ($this->has($name)) {
$value = $this->get($name) + $step;
} else {
$value = $step;
}
return $this->set($name, $value, 0) ? $value : false;
}
/**
* 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, $step = 1)
{
if ($this->has($name)) {
$value = $this->get($name) - $step;
} else {
$value = -$step;
}
return $this->set($name, $value, 0) ? $value : false;
}
/**
* 删除缓存
* @access public
* @param string $name 缓存变量名
* @return boolean
*/
public function rm($name)
{
return unlink($this->getCacheKey($name));
}
/**
* 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 $key) {
unlink($key);
}
$this->rm('tag_' . md5($tag));
return true;
}
array_map("unlink", glob($this->options['path'] . ($this->options['prefix'] ? $this->options['prefix'] . DS : '') . '*.php'));
}
}