为大家分享很全的php文件缓存，供大家参考，具体内容如下
<?php class cache { private static $_instance = null; protected $_options = array( 'cache_dir' => "./", 'file_name_prefix' => 'cache', 'mode' => '1', //mode 1 为serialize model 2为保存为可执行文件 ); /** * 得到本类实例 * * @return Ambiguous */ public static function getInstance() { if(self::$_instance === null) { self::$_instance = new self(); } return self::$_instance; } /** * 得到缓存信息 * * @param string $id * @return boolean|array */ public static function get($id) { $instance = self::getInstance(); //缓存文件不存在 if(!$instance->has($id)) { return false; } $file = $instance->_file($id); $data = $instance->_fileGetContents($file); if($data['expire'] == 0 || time() < $data['expire']) { return $data['contents']; } return false; } /** * 设置一个缓存 * * @param string $id 缓存id * @param array $data 缓存内容 * @param int $cacheLife 缓存生命 默认为0无限生命 */ public static function set($id, $data, $cacheLife = 0) { $instance = self::getInstance(); $time = time(); $cache = array(); $cache['contents'] = $data; $cache['expire'] = $cacheLife === 0 ? 0 : $time + $cacheLife; $cache['mtime'] = $time; $file = $instance->_file($id); return $instance->_filePutContents($file, $cache); } /** * 清除一条缓存 * * @param string cache id * @return void */ public static function delete($id) { $instance = self::getInstance(); if(!$instance->has($id)) { return false; } $file = $instance->_file($id); //删除该缓存 return unlink($file); } /** * 判断缓存是否存在 * * @param string $id cache_id * @return boolean true 缓存存在 false 缓存不存在 */ public static function has($id) { $instance = self::getInstance(); $file = $instance->_file($id); if(!is_file($file)) { return false; } return true; } /** * 通过缓存id得到缓存信息路径 * @param string $id * @return string 缓存文件路径 */ protected function _file($id) { $instance = self::getInstance(); $fileNmae = $instance->_idToFileName($id); return $instance->_options['cache_dir'] . $fileNmae; } /** * 通过id得到缓存信息存储文件名 * * @param $id * @return string 缓存文件名 */ protected function _idToFileName($id) { $instance = self::getInstance(); $prefix = $instance->_options['file_name_prefix']; return $prefix . '---' . $id; } /** * 通过filename得到缓存id * * @param $id * @return string 缓存id */ protected function _fileNameToId($fileName) { $instance = self::getInstance(); $prefix = $instance->_options['file_name_prefix']; return preg_replace('/^' . $prefix . '---(.*)$/', '$1', $fileName); } /** * 把数据写入文件 * * @param string $file 文件名称 * @param array $contents 数据内容 * @return bool */ protected function _filePutContents($file, $contents) { if($this->_options['mode'] == 1) { $contents = serialize($contents); } else { $time = time(); $contents = "<?php\n". " // mktime: ". $time. "\n". " return ". var_export($contents, true). "\n?>"; } $result = false; $f = @fopen($file, 'w'); if ($f) { @flock($f, LOCK_EX); fseek($f, 0); ftruncate($f, 0); $tmp = @fwrite($f, $contents); if (!($tmp === false)) { $result = true; } @fclose($f); } @chmod($file,0777); return $result; } /** * 从文件得到数据 * * @param sring $file * @return boolean|array */ protected function _fileGetContents($file) { if(!is_file($file)) { return false; } if($this->_options['mode'] == 1) { $f = @fopen($file, 'r'); @$data = fread($f,filesize($file)); @fclose($f); return unserialize($data); } else { return include $file; } } /** * 构造函数 */ protected function __construct() { } /** * 设置缓存路径 * * @param string $path * @return self */ public static function setCacheDir($path) { $instance = self::getInstance(); if (!is_dir($path)) { exit('file_cache: ' . $path.' 不是一个有效路径 '); } if (!is_writable($path)) { exit('file_cache: 路径 "'.$path.'" 不可写'); } $path = rtrim($path,'https://www.jb51.net/') . 'https://www.jb51.net/'; $instance->_options['cache_dir'] = $path; return $instance; } /** * 设置缓存文件前缀 * * @param srting $prefix * @return self */ public static function setCachePrefix($prefix) { $instance = self::getInstance(); $instance->_options['file_name_prefix'] = $prefix; return $instance; } /** * 设置缓存存储类型 * * @param int $mode * @return self */ public static function setCacheMode($mode = 1) { $instance = self::getInstance(); if($mode == 1) { $instance->_options['mode'] = 1; } else { $instance->_options['mode'] = 2; } return $instance; } /** * 删除所有缓存 * @return boolean */ public static function flush() { $instance = self::getInstance(); $glob = @glob($instance->_options['cache_dir'] . $instance->_options['file_name_prefix'] . '--*'); if(empty($glob)) { return false; } foreach ($glob as $v) { $fileName = basename($v); $id = $instance->_fileNameToId($fileName); $instance->delete($id); } return true; } } /* 初始化设置cache的配置信息什么的 */ cache::setCachePrefix('core'); //设置缓存文件前缀 cache::setCacheDir('./cache'); //设置存放缓存文件夹路径 //模式1 缓存存储方式 //a:3:{s:8:"contents";a:7:{i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:34;i:4;i:5;i:5;i:6;i:6;i:6;}s:6:"expire";i:0;s:5:"mtime";i:1318218422;} //模式2 缓存存储方式 /* <?php // mktime: 1318224645 return array ( 'contents' => array ( 0 => 1, 1 => 2, 2 => 3, 3 => 34, 4 => 5, 5 => 6, 6 => 6, ), 'expire' => 0, 'mtime' => 1318224645, ) ?> * * */ cache::setCacheMode('2'); if(!$row = cache::get('zj2')) { $array = array(1,2,3,34,5,6,6); $row = cache::set('zj2',$array); } // cache::flush(); 清空所有缓存 print_r($row);
文件缓存class