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  • php 文件缓存

    http://www.oschina.net/code/snippet_162279_6098

    <?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 ".
                        " // mktime: ". $time. " ".
                        " return ".
                        var_export($contents, true).
                        " ?>";
            }
             
            $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,'/') . '/';
            $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);
        
     

    [2].[代码] 文件缓存 class 跳至 [1] [2] [3] [4] [5] [6]

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    <?php
    /**
     * 文件缓存类
     * @author  xiaojiong & 290747680@qq.com
     * @date 2011-08-17
     */
    class cache
    {
        const FILE_LIFE_KEY = 'FILE_LIFE_KEY';
         
        const CLEAR_ALL_KEY = 'CLEAR_ALL';
         
        static $_instance = null;
         
        protected $_options = array(
            'cache_dir' => './cache',
            'file_locking' => true,
            'file_name_prefix' => 'cache',
            'cache_file_umask' => 0777,
            'file_life'  => 100000
        );
         
        static function &getInstance($options = array())
        {
            if(self::$_instance === null)
            {
                self::$_instance = new self($options);
            }  
            return self::$_instance;
        }
         
        /**
         * 设置参数
         * @param  array $options 缓存参数
         * @return void
         */
        static function &setOptions($options = array())
        {
                return self::getInstance($options);
        }
         
        /**
         * 构造函数
         * @param  array $options 缓存参数
         * @return void
         */
        private function __construct($options = array())
        {      
            if ($this->_options['cache_dir'] !== null) {
                 
                $dir = rtrim($this->_options['cache_dir'],'/') . '/';
                $this->_options['cache_dir'] = $dir;
                 
                if (!is_dir($this->_options['cache_dir'])) {
                    mkdir($this->_options['cache_dir'],0777,TRUE);
                }
                if (!is_writable($this->_options['cache_dir'])) {
                    exit('file_cache: 路径 "'. $this->_options['cache_dir'] .'" 不可写');
                }
              
            } else {
               exit('file_cache: "options" cache_dir 不能为空 ');
            }
        }
     
        /**
         * 设置缓存路径
         * @param  string  $value
         * @return void
         */
        static function setCacheDir($value)
        {
            $self = & self::getInstance();
             
            if (!is_dir($value)) {
                exit('file_cache: ' . $value.' 不是一个有效路径 ');
            }
            if (!is_writable($value)) {
                exit('file_cache: 路径 "'.$value.'" 不可写');
            }
         
            $value = rtrim($this->_options['cache_dir'],'/') . '/';
             
            $self->_options['cache_dir'] = $value;
        }
         
        /**
         * 存入缓存数据
         * @param  array  $data          放入缓存的数据
         * @param  string $id            缓存id(又名缓存识别码)
         * @param  cache_life            缓存时间
         * @return boolean True if no problem
         */
        static function save($data, $id = null, $cache_life = null)
        {
            $self = & self::getInstance();
            if (!$id) {
                if ($self->_id) {
                    $id = $self->_id;
                } else {
                    exit('file_cache:save() id 不能为空!');
                }
            }
            $time = time();
             
            if($cache_life) {
                $data[self::FILE_LIFE_KEY] = $time + $cache_life;
            }
            elseif
            ($cache_life != 0){
                $data[self::FILE_LIFE_KEY] = $time + $self->_options['file_life'];
            }
             
            $file = $self->_file($id);
             
            $data = "<?php ".
                    " // mktime: ". $time. " ".
                    " return ".
                    var_export($data, true).
                    " ?>"
                    ;
             
            $res = $self->_filePutContents($file, $data);
            return $res;
        }
         
         
        /**
         * 得到缓存信息
         *
         * @param  string  $id  缓存id
         * @return string|array 缓存数据
         */
        static function load($id)
        {
            $self = & self::getInstance();
            $time = time();
            //检测缓存是否存在
            if (!$self->test($id)) {
                // The cache is not hit !
                return false;
            }
             
            //全部清空识别文件
            $clearFile = $self->_file(self::CLEAR_ALL_KEY);
             
            $file = $self->_file($id);
             
            //判断缓存是否已被全部清除
            if(is_file($clearFile) && filemtime($clearFile) > filemtime($file))
            {
                return false;
            }
            
            $data = $self->_fileGetContents($file);
            if(empty($data[self::FILE_LIFE_KEY]) || $time < $data[self::FILE_LIFE_KEY]) {
                unset($data[self::FILE_LIFE_KEY]);
                return $data;          
            }
            return false;
        }   
         
        /**
         * 写入缓存文件
         *
         * @param  string $file   缓存路径
         * @param  string $string 缓存信息
         * @return boolean true 成功
         */
        protected function _filePutContents($file, $string)
        {
            $self = & self::getInstance();
            $result = false;
            $f = @fopen($file, 'ab+');
            if ($f) {
                if ($self->_options['file_locking']) @flock($f, LOCK_EX);
                fseek($f, 0);
                ftruncate($f, 0);
                $tmp = @fwrite($f, $string);
                if (!($tmp === false)) {
                    $result = true;
                }
                @fclose($f);
            }
            @chmod($file, $self->_options['cache_file_umask']);
            return $result;
        }
         
        /**
         * 格式化后的缓存文件路径
         *
         * @param  string $id 缓存id
         * @return string 缓存文件名(包括路径)
         */
        protected function _file($id)
        {
            $self = & self::getInstance();
            $fileName = $self->_idToFileName($id);
            return $self->_options['cache_dir'] . $fileName;
        }   
         
        /**
         * 格式化后的缓存文件名字
         *
         * @param  string $id 缓存id
         * @return string 缓存文件名
         */
        protected function _idToFileName($id)
        {
            $self = & self::getInstance();
            $self->_id = $id;
            $prefix = $self->_options['file_name_prefix'];
            $result = $prefix . '---' . $id;
            return $result;
        }  
         
        /**
         * 判断缓存是否存在
         *
         * @param  string $id Cache id
         * @return boolean True 缓存存在 False 缓存不存在
         */
        static function test($id)
        {
            $self = & self::getInstance();
            $file = $self->_file($id);
             
            if (!is_file($file)) {
                return false;
            }
             
            return true;
        }
         
        /**
         * 得到缓存信息
         *
         * @param  string $file 缓存路径
         * @return string 缓存内容
         */
        protected function _fileGetContents($file)
        {
            if (!is_file($file)) {
                return false;
            }
            return include $file;
        }    
         
        /**
         * 清除所有缓存
         *
         * @return void
         */   
        static function clear()
        {
            $self = & self::getInstance();
            $self->save('CLEAR_ALL',self::CLEAR_ALL_KEY);   
        }  
         
        /**
         * 清除一条缓存
         *
         * @param string cache id   
         * @return void
         */  
        static function del($id)
        {
            $self = & self::getInstance();
            if(!$self->test($id)){
                // 该缓存不存在
                return false;
            }
            $file = $self->_file($id);
            return unlink($file);
        }  
    }
     

    [3].[代码] 存入数据 跳至 [1] [2] [3] [4] [5] [6]

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    <?php
    $config = array(
        'name' => 'xiaojiong',
        'qq'   => '290747680',
        'age'  => '20',
    );
     
    //第一个参数 缓存data
    //第二个参数 缓存id
    //第三个参数 cache_life 0 永不过期(cache::clear()清空所有除外) 默认cache_life 为option_cache_life
    cache::save($config,'config',0);
     

    [4].[代码] 载入数据 跳至 [1] [2] [3] [4] [5] [6]

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    <?php
    //只有一个参数 cache_id
    $config = cache::load('config');
     

    [5].[代码] 清空缓存 跳至 [1] [2] [3] [4] [5] [6]

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    <?php
    //清空指定缓存
    cache::del('config');
    //清空所有缓存
    cache::clear();
     

    [6].[代码] cache信息配置 跳至 [1] [2] [3] [4] [5] [6]

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    //在执行所有cache_func前调用
     
    $_options = array(
        'cache_dir' => './cache', //缓存文件目录
        'file_name_prefix' => 'cache',//缓存文件前缀
        'file_life'  => 100000, //缓存文件生命
    );
    cache::setOptions($options);
     
    //再执行 就会按着新配置信息执行，否则是默认信息
    cache::save($arr,'arr');
     
     
    //就是这个方法 貌似不合理 望大家指点
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  • 原文地址：https://www.cnblogs.com/jukan/p/5641201.html
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