PHP文件缓存类

<?php
    /*
    name:PHP文件缓存类
    author:xiaoz.me
    QQ:337003006
    update:2019-04-14
    */
    //设置缓存路径
    define('CPATH', './caches');
    //检查缓存目录是否存在
    if(!is_dir(CPATH)){
        mkdir(CPATH,0777,true);
    }
    
    class Cache{
        //生成缓存
        function create($key,$cacheTime,$content){
            //完整的缓存路径
            $fullpath = CPATH.'/'.$key;

            //获取缓存文件时间
            @$fileTime = filemtime($fullpath);
            @(int)$fileTime = date("YmdHi",$fileTime);
            //获取当前时间
            (int)$theTime = date("YmdHi",time());
            //到期时间
            (int)$endTime = $theTime + $cacheTime;
            //计算时间差
            $timeDiff = $theTime - $fileTime;
            //重组缓存内容
            $tmpdata = array(
                "key"    =>    $key,
                "ctime"    =>    (int)$theTime,
                "etime"    =>    (int)$endTime,
                "data"    =>    $content
            );
            $content = json_encode($tmpdata);
            //缓存过期了，重新生成
            if((!file_exists($fullpath)) || ($timeDiff > $cacheTime)){
                $myfile = fopen($fullpath,"w") or die("Unable to open file!");
                fwrite($myfile, $content);
                fclose($myfile);
            }
            //读取缓存
            $myfile = fopen($fullpath,"r") or die("Unable to open file!");
            @$cacheContent = fread($myfile,filesize($fullpath));
            fclose($myfile);

            //返回文件内容
            return $cacheContent;
        }
        //删除缓存
        function delete($key = 'all'){
            //删除所有缓存文件
            if($key == 'all'){
                $cachedir = CPATH;

                $arr = scandir($cachedir);

                foreach ($arr as $value) {
                    if(($value == 'index.html') || ($value == '.') || ($value == '..')){
                        continue;
                    }
                    @unlink($cachedir.'/'.$value);
                }
            }
            //删除单个缓存
            else{
                //完整的缓存路径
                $fullpath = CPATH.'/'.$key;
                @unlink($fullpath);
            }
        }
        //刷新缓存
        function flush($key,$cacheTime,$content){
            //先删除缓存
            $this->delete($key);
            //然后重新生成缓存
            $this->create($key,$cacheTime,$content);
        }
        //读取缓存
        function get($key){
            //完整的缓存路径
            $fullpath = CPATH.'/'.$key;
            if(!is_file($fullpath)){
                return FALSE;
                exit;
            }
            //获取当前时间
            (int)$theTime = date("YmdHi",time());
            @$myfile = fopen($fullpath,"r") or die("Unable to open file!");
            @$cacheContent = fread($myfile,filesize($fullpath));
            fclose($myfile);
            $tmpdata = json_decode($cacheContent);
            //如果缓存过期
            if(($theTime > $tmpdata->etime)){
                return FALSE;
                exit;
            }
            else{
                return $tmpdata->data;
            }
        }
    }
?>

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