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php 文件缓存

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Libérer: 2016-05-25 17:13:20
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php 文件缓存

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<?php

class cache

{  

    private static $_instance = null;

 

    protected $_options = array(

        &#39;cache_dir&#39;        => "./",

        &#39;file_name_prefix&#39; => &#39;cache&#39;,

        &#39;mode&#39;            => &#39;1&#39;, //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[&#39;expire&#39;] == 0 || time() < $data[&#39;expire&#39;])

        {

            return $data[&#39;contents&#39;];

        }

        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[&#39;contents&#39;] = $data;

        $cache[&#39;expire&#39;]   = $cacheLife === 0 ? 0 : $time + $cacheLife;

        $cache[&#39;mtime&#39;]    = $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[&#39;cache_dir&#39;] . $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[&#39;file_name_prefix&#39;];

        return $prefix . &#39;---&#39; . $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[&#39;file_name_prefix&#39;];

        return preg_replace(&#39;/^&#39; . $prefix . &#39;---(.*)$/&#39;, &#39;$1&#39;, $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[&#39;mode&#39;] == 1)

        {

            $contents = serialize($contents);

        }

        else

        {

            $time = time();

            $contents = "<?php\n".

                    " // mktime: ". $time. "\n".

                    " return ".

                    var_export($contents, true).

                    "\n?>";

        }

         

        $result = false;

        $f = @fopen($file, &#39;w&#39;);

        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[&#39;mode&#39;] == 1)

        {

            $f = @fopen($file, &#39;r&#39;);

            @$data = fread($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(&#39;file_cache: &#39; . $path.&#39; 不是一个有效路径 &#39;);

        }

        if (!is_writable($path)) {

            exit(&#39;file_cache: 路径 "&#39;.$path.&#39;" 不可写&#39;);

        }

     

        $path = rtrim($path,&#39;/&#39;) . &#39;/&#39;;

        $instance->_options[&#39;cache_dir&#39;] = $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[&#39;file_name_prefix&#39;] = $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[&#39;mode&#39;] = 1;

        }

        else

        {

            $instance->_options[&#39;mode&#39;] = 2;

        }

         

        return $instance;

    }

     

    /**

     * 删除所有缓存

     * @return boolean

     */

    public static function flush()

    {

        $instance  = self::getInstance();

   $glob = @glob($instance->_options[&#39;cache_dir&#39;] . $instance->_options[&#39;file_name_prefix&#39;] . &#39;--*&#39;);

         

        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(&#39;core&#39;); //设置缓存文件前缀

cache::setCacheDir(&#39;./cache&#39;); //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 (

  &#39;contents&#39; =>

  array (

    0 => 1,

    1 => 2,

    2 => 3,

    3 => 34,

    4 => 5,

    5 => 6,

    6 => 6,

  ),

  &#39;expire&#39; => 0,

  &#39;mtime&#39; => 1318224645,

)

?>

 *

 *

 */

cache::setCacheMode(&#39;2&#39;);

 

if(!$row = cache::get(&#39;zj2&#39;))

{

     

    $array = array(1,2,3,34,5,6,6);

    $row = cache::set(&#39;zj2&#39;,$array);

}

// cache::flush(); 清空所有缓存

 

print_r($row);

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2. [代码]文件缓存 class

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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 = &#39;FILE_LIFE_KEY&#39;;

     

    const CLEAR_ALL_KEY = &#39;CLEAR_ALL&#39;;

     

    static $_instance = null;

     

    protected $_options = array(

        &#39;cache_dir&#39; => &#39;./cache&#39;,

        &#39;file_locking&#39; => true,

        &#39;file_name_prefix&#39; => &#39;cache&#39;,

        &#39;cache_file_umask&#39; => 0777,

        &#39;file_life&#39;  => 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[&#39;cache_dir&#39;] !== null) {

             

            $dir = rtrim($this->_options[&#39;cache_dir&#39;],&#39;/&#39;) . &#39;/&#39;;

            $this->_options[&#39;cache_dir&#39;] = $dir;

             

            if (!is_dir($this->_options[&#39;cache_dir&#39;])) {

                mkdir($this->_options[&#39;cache_dir&#39;],0777,TRUE);

            }

            if (!is_writable($this->_options[&#39;cache_dir&#39;])) {

                exit(&#39;file_cache: 路径 "&#39;. $this->_options[&#39;cache_dir&#39;] .&#39;" 不可写&#39;);

            }

          

        } else {

           exit(&#39;file_cache: "options" cache_dir 不能为空 &#39;);

        }

    }

 

    /**

     * 设置缓存路径

     * @param  string  $value

     * @return void

     */

    static function setCacheDir($value)

    {

        $self = & self::getInstance();

         

        if (!is_dir($value)) {

            exit(&#39;file_cache: &#39; . $value.&#39; 不是一个有效路径 &#39;);

        }

        if (!is_writable($value)) {

            exit(&#39;file_cache: 路径 "&#39;.$value.&#39;" 不可写&#39;);

        }

     

        $value = rtrim($this->_options[&#39;cache_dir&#39;],&#39;/&#39;) . &#39;/&#39;;

         

        $self->_options[&#39;cache_dir&#39;] = $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(&#39;file_cache:save() id 不能为空!&#39;);

            }

        }

        $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[&#39;file_life&#39;];

        }

         

        $file = $self->_file($id);

         

        $data = "<?php\n".

                " // mktime: ". $time. "\n".

                " return ".

                var_export($data, true).

                "\n?>"

                ;

         

        $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, &#39;ab+&#39;);

        if ($f) {

            if ($self->_options[&#39;file_locking&#39;]) @flock($f, LOCK_EX);

            fseek($f, 0);

            ftruncate($f, 0);

            $tmp = @fwrite($f, $string);

            if (!($tmp === false)) {

                $result = true;

            }

            @fclose($f);

        }

        @chmod($file, $self->_options[&#39;cache_file_umask&#39;]);

        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[&#39;cache_dir&#39;] . $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[&#39;file_name_prefix&#39;];

        $result = $prefix . &#39;---&#39; . $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(&#39;CLEAR_ALL&#39;,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);

    }  

}

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3. [代码]存入数据

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<?php

$config = array(

    &#39;name&#39; => &#39;xiaojiong&#39;,

    &#39;qq&#39;   => &#39;290747680&#39;,

    &#39;age&#39;  => &#39;20&#39;,

);

 

//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,&#39;config&#39;,0);

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4. [代码]载入数据

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<?php

//只有一个参数 cache_id

$config = cache::load(&#39;config&#39;);

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5. [代码]清空缓存

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<?php

//清空指定缓存

cache::del(&#39;config&#39;);

//清空所有缓存

cache::clear();

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6. [代码]cache信息配置

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//在执行所有cache_func前调用

 

$_options = array(

    &#39;cache_dir&#39; => &#39;./cache&#39;, //缓存文件目录

    &#39;file_name_prefix&#39; => &#39;cache&#39;,//缓存文件前缀

    &#39;file_life&#39;  => 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,&#39;arr&#39;);

 

 

//就是这个方法 貌似不合理 望大家指点

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以上就是php 文件缓存的内容,更多相关内容请关注PHP中文网(www.php.cn)!


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