PHP文件缓存函数

发一个自己写的PHP文件缓存函数

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/** +---------------------------------------------------------- * PHP文件缓存函数 * @author LiuYuanjun <http://www.liuyuanjun.com> +---------------------------------------------------------- * @param string $key 缓存KEY 设为null则清空所有缓存 * @param mixed $data 缓存内容 设为null则删除KEY为$key的缓存 * @param int $time 缓存时间 秒数，如果大于当前时间戳则按照时间戳来处理，为0则永不过期 +---------------------------------------------------------- * @return mixed +---------------------------------------------------------- */ function file_cache($key, $data='', $time=0) {     $cacheDir = ROOTPATH . 'Cache' . DS; //这里设置缓存目录     $timestamp = time();     if ($key === null) { //clear all         $dirFiles = scandir($cacheDir);         foreach ($dirFiles as $dirFile) {             if ($dirFile != '.' && $dirFile != '..')                 @unlink($cacheDir . $dirFile);         }     }     $cachePath = $cacheDir . '~' . $key . '.php';     if ($data === '') { //get cache         if (!is_file($cachePath))             return false;         $cacheData = @require $cachePath;         if ($cacheData[0] > 0 && $cacheData[0] < $timestamp) {             @unlink($cachePath);             return false;         } else {             return @unserialize($cacheData[1]);         }     }     if ($data === null)         @unlink($cachePath); //delete cache     $time = intval($time);     $deadline = $time == 0 ? 0 : ($time>$timestamp?$time:($timestamp+$time));     $storeData = '<?php return array(' . $deadline . ',\'' . serialize($data) . '\'); ?>';     @file_put_contents($cachePath, $storeData); }