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thinkphp/library/think/cache/driver/Lite.php

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+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2017 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'));
+    }
+}