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php文件缓存类实例整理

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Jun 13, 2016 am 09:49 AM

php under Function Example Commonly used application develop I us tidy document yes of kind cache

缓存类是我们开发应用中会常用使用到的功能，下面我来给大家整理几个php文件缓存类了，各个文件缓存类写法不同，但在性能上会有区别，有兴趣测试的朋友可测试一下这些缓存类吧。

例1

代码如下

复制代码

$fzz = new fzz_cache;
$fzz->kk = $_SERVER; //写入缓存
//$fzz->set("kk",$_SERVER,10000); //此方法不与类属性想冲突，可以用任意缓存名；
print_r($fzz->kk); //读取缓存
//print_r($fzz->get("kk"));
//unset($fzz->kk); //删除缓存
//$fzz->_unset("kk");
var_dump(isset($fzz->kk)); //判断缓存是否存在
//$fzz->_isset("kk");
//$fzz->clear(); //清理过期缓存
//$fzz->clear_all(); //清理所有缓存文件
class fzz_cache{
public $limit_time = 20000; //缓存过期时间
public $cache_dir = "data"; //缓存文件保存目录

//写入缓存
function __set($key , $val){
  $this->_set($key ,$val);
}
//第三个参数为过期时间
function _set($key ,$val,$limit_time=null){
  $limit_time = $limit_time ? $limit_time : $this->limit_time;
  $file = $this->cache_dir."/".$key.".cache";
  $val = serialize($val);
  @file_put_contents($file,$val) or $this->error(__line__,"fail to write in file");
  @chmod($file,0777);
  @touch($file,time()+$limit_time) or $this->error(__line__,"fail to change time");
}

//读取缓存
function __get($key){
  return $this->_get($key);
}
function _get($key){
  $file = $this->cache_dir."/".$key.".cache";
  if (@filemtime($file)>=time()){
   return unserialize(file_get_contents($file));
  }else{
   @unlink($file) or $this->error(__line__,"fail to unlink");
   return false;
  }
}

//删除缓存文件
function __unset($key){
  return $this->_unset($key);
}
function _unset($key){
  if (@unlink($this->cache_dir."/".$key.".cache")){
   return true;
  }else{
   return false;
  }
}

//检查缓存是否存在，过期则认为不存在
function __isset($key){
  return $this->_isset($key);
}
function _isset($key){
  $file = $this->cache_dir."/".$key.".cache";
  if (@filemtime($file)>=time()){
   return true;
  }else{
   @unlink($file) ;
   return false;
  }
}

//清除过期缓存文件
function clear(){
  $files = scandir($this->cache_dir);
  foreach ($files as $val){
   if (filemtime($this->cache_dir."/".$val)     @unlink($this->cache_dir."/".$val);
   }
  }
}

//清除所有缓存文件
function clear_all(){
  $files = scandir($this->cache_dir);
  foreach ($files as $val){
   @unlink($this->cache_dir."/".$val);
  }
}

function error($msg,$debug = false) {
  $err = new Exception($msg);
  $str = "

<br>
<span style="color:red">error:</span><br>
".print_r($err->getTrace(),1)."<br>

Copy after login

";
  if($debug == true) {
   file_put_contents(date('Y-m-d H_i_s').".log",$str);
   return $str;
  }else{
   die($str);
  }
}
}
?>

例2.从CI社区的stblog和CI的file_helper类中提取出来的php文件缓存类,一个简单的基于文件的key->value缓存类。

这个类可以用来缓存一些基本信息,比如博客的header,footer,sidebar中的一些不经常变化，从数据库中取出的

内容,取数据前先判断文件缓存中的内容是否过期,如果没过期取出来,过期了则连接数据库查询,并将结果重新

写入文件缓存,更新过期时间。跟memcache使用类似,不过更方便。用在一些小的应用上足够了...代码如下

代码如下

复制代码

define('DIRECTORY_SEPARATOR','/');
define('FOPEN_WRITE_CREATE_DESTRUCTIVE','wb');
define('FOPEN_WRITE_CREATE','ab');
define('DIR_WRITE_MODE', 0777);
class FileCache {

/**
     * 缓存路径
     *
     * @access private
     * @var string
     */
private $_cache_path;

/**
     * 缓存过期时间，单位是秒second
     *
     * @access private
     * @var int
     */
private $_cache_expire;

/**
     * 解析函数，设置缓存过期实践和存储路径
     *
     * @access public
     * @return void
     */
public function __construct($expire, $cache_path)
{
$this->_cache_expire = $expire;
$this->_cache_path = $cache_path;
}

/**
     * 缓存文件名
     *
     * @access public
     * @param string $key
     * @return void
     */
private function _file($key)
{
return $this->_cache_path . md5($key);
}

/**
     * 设置缓存
     *
     * @access public
     * @param string $key 缓存的唯一键
     * @param string $data 缓存的内容
     * @return bool
     */
public function set($key, $data)
{
$value = serialize($data);

$file = $this->_file($key);

     return $this->write_file($file, $value);
}

/**
     * 获取缓存
     *
     * @access public
     * @param string $key 缓存的唯一键
     * @return mixed
     */
public function get($key)
{
$file = $this->_file($key);

/** 文件不存在或目录不可写 */
if (!file_exists($file) || !$this->is_really_writable($file))
{
   return false;
}

/** 缓存没有过期，仍然可用 */
if ( time() _cache_expire) )
{

   $data = $this->read_file($file);

   if(FALSE !== $data)
   {
    return unserialize($data);
   }

   return FALSE;
}

/** 缓存过期，删除之 */
@unlink($file);
return FALSE;
}

function read_file($file)
{
if ( ! file_exists($file))
{
   return FALSE;
}

if (function_exists('file_get_contents'))
{
   return file_get_contents($file);
}

if ( ! $fp = @fopen($file, FOPEN_READ))
{
return FALSE;
}

flock($fp, LOCK_SH);//读取之前加上共享锁

$data = '';
if (filesize($file) > 0)
{
$data =& fread($fp, filesize($file));
}

flock($fp, LOCK_UN);//释放锁
fclose($fp);

return $data;
}

function write_file($path, $data, $mode = FOPEN_WRITE_CREATE_DESTRUCTIVE)
{
if ( ! $fp = @fopen($path, $mode))
{
   return FALSE;
}

flock($fp, LOCK_EX);
fwrite($fp, $data);
flock($fp, LOCK_UN);
fclose($fp);

return TRUE;
}
function is_really_writable($file)//兼容各平台判断文件是否有写入权限
{
// If we're on a Unix server with safe_mode off we call is_writable
if (DIRECTORY_SEPARATOR == '/' AND @ini_get("safe_mode") == FALSE)
{
   return is_writable($file);
}

// For windows servers and safe_mode "on" installations we'll actually
// write a file then read it. Bah...
if (is_dir($file))
{
   $file = rtrim($file, '/').'/'.md5(rand(1,100));

   if (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
   {
    return FALSE;
   }

   fclose($fp);
   @chmod($file, DIR_WRITE_MODE);
   @unlink($file);
   return TRUE;
}
elseif (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
{
   return FALSE;
}

fclose($fp);
return TRUE;
}
}
$cache = new FileCache(30,'cache/');
$cache->set('test','this is a test.');
print $cache->get('test');
/* End of file FlieCache.php */

例3.自己觉得很好用的php文件缓存

代码如下

复制代码

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()   {
   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 = "                  " // 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,'/') . '/';
        $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
/*
// 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);

件缓存 class

/**
* 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 = "                 " // 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]) || $time             unset($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);
    }
}

存入数据

$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);

载入数据

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

清空缓存

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

cache信息配置

//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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