library\think\cache\driver\File.php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st
// +----------------------------------------------------------------------
namespace think\cache\driver;
use think\cache\Driver;
/**
* 文件类型缓存类
* @author liu21st
*/
class File extends Driver
{
protected $options = [
'expire' => 0,
'cache_subdir' => false,
'prefix' => '',
'path' => CACHE_PATH,
'data_compress' => false,
];
/**
* 架构函数
* @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;
}
$this->init();
}
/**
* 初始化检查
* @access private
* @return boolean
*/
private function init()
{
// 创建项目缓存目录
if (!is_dir($this->options['path'])) {
if (mkdir($this->options['path'], 0755, true)) {
return true;
}
}
return false;
}
/**
* 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)
{
$name = md5($name);
if ($this->options['cache_subdir']) {
// 使用子目录
$name = substr($name, 0, 2) . DS . substr($name, 2);
}
if ($this->options['prefix']) {
$name = $this->options['prefix'] . DS . $name;
}
$filename = $this->options['path'] . $name . '.php';
$dir = dirname($filename);
if (!is_dir($dir)) {
mkdir($dir, 0755, true);
}
return $filename;
}
/**
* 判断缓存是否存在
* @access public
* @param string $name 缓存变量名
* @return bool
*/
public function has($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)) {
return $default;
}
$content = file_get_contents($filename);
if (false !== $content) {
$expire = (int) substr($content, 8, 12);
if (0 != $expire && $_SERVER['REQUEST_TIME'] > filemtime($filename) + $expire) {
//缓存过期删除缓存文件
$this->unlink($filename);
return $default;
}
$content = substr($content, 20, -3);
if ($this->options['data_compress'] && function_exists('gzcompress')) {
//启用数据压缩
$content = gzuncompress($content);
}
$content = unserialize($content);
return $content;
} 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 int $expire 有效时间 0为永久
* @return boolean
*/
public function set($name, $value, $expire = null)
{
if (is_null($expire)) {
$expire = $this->options['expire'];
}
$filename = $this->getCacheKey($name);
if ($this->tag && !is_file($filename)) {
$first = true;
}
$data = serialize($value);
if ($this->options['data_compress'] && function_exists('gzcompress')) {
//数据压缩
$data = gzcompress($data, 3);
}
$data = "";
$result = file_put_contents($filename, $data);
if ($result) {
isset($first) && $this->setTagItem($filename);
clearstatcache();
return true;
} else {
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, $step = 1)
{
if ($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 $this->unlink($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) {
$this->unlink($key);
}
$this->rm('tag_' . md5($tag));
return true;
}
$files = (array) glob($this->options['path'] . ($this->options['prefix'] ? $this->options['prefix'] . DS : '') . '*');
foreach ($files as $path) {
if (is_dir($path)) {
array_map('unlink', glob($path . '/*.php'));
} else {
unlink($path);
}
}
return true;
}
/**
* 判断文件是否存在后，删除
* @param $path
* @return bool
* @author byron sampson
* @return boolean
*/
private function unlink($path)
{
return is_file($path) && unlink($path);
}
}