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php文件缓存方法总结,

Jun 13, 2016 am 08:44 AM
php File cache

php文件缓存方法总结,

为大家分享很全的php文件缓存,供大家参考,具体内容如下

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<&#63;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 &#63; 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 = "<&#63;php\n".

     " // mktime: ". $time. "\n".

     " return ".

     var_export($contents, true).

     "\n&#63;>";

  }

   

  $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

/*

 <&#63;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,

)

&#63;>

 *

 *

 */

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);

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文件缓存class

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<&#63;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 = "<&#63;php\n".

    " // mktime: ". $time. "\n".

    " return ".

    var_export($data, true).

    "\n&#63;>"

    ;

    

  $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);

 }

}

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存入数据

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<&#63;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);

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载入数据

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<&#63;php

//只有一个参数 cache_id

$config = cache::load('config');

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清空缓存

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<&#63;php

//清空指定缓存

cache::del('config');

//清空所有缓存

cache::clear();

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cache信息配置

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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

Copy after login

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