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

 "./",
  'file_name_prefix' => 'cache',
  'mode'   => '1', //mode 1 为serialize model 2为保存为可执行文件
 ); 
 
 
 public static function getInstance()
 {
  if(self::$_instance === null)
  {
   self::$_instance = new self();
  }
  return self::$_instance;
 } 
 
 
 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;
 }
 
 
 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);
 }
 
  
 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);
 }
 
 
 public static function has($id)
 {
  $instance = self::getInstance();
  $file  = $instance->_file($id);
  
  if(!is_file($file))
  {
   return false;
  }
  return true;
 }
 
 
 protected function _file($id)
 {
  $instance = self::getInstance();
  $fileNmae = $instance->_idToFileName($id);
  return $instance->_options['cache_dir'] . $fileNmae;
 } 
 
 
 protected function _idToFileName($id)
 {
  $instance = self::getInstance();
  $prefix = $instance->_options['file_name_prefix'];
  return $prefix . '---' . $id;
 }
 
 
 protected function _fileNameToId($fileName)
 {
  $instance = self::getInstance();
  $prefix = $instance->_options['file_name_prefix'];
  return preg_replace('/^' . $prefix . '---(.*)$/', '$1', $fileName);
 }
 
 
 protected function _filePutContents($file, $contents)
 {
  if($this->_options['mode'] == 1)
  {
   $contents = serialize($contents);
  }
  else 
  {
   $time = time(); 
   $contents = "";
  }
  
  $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;    
 }
 
 
 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;
  }
 }
 
 
 protected function __construct()
 {
 
 }
 
 
 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;
 }
 
 
 public static function setCachePrefix($prefix)
 {
  $instance = self::getInstance();
  $instance->_options['file_name_prefix'] = $prefix;
  return $instance;
 }
 
 
 public static function setCacheMode($mode = 1)
 {
  $instance = self::getInstance();
  if($mode == 1)
  {
   $instance->_options['mode'] = 1;
  }
  else
  {
   $instance->_options['mode'] = 2;
  }
  
  return $instance;
 }
 
 
 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;
 }
}


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

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

 './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;
 }
  
 
 static function &setOptions($options = array())
 {
   return self::getInstance($options);
 }
  
 
 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 ');
  }
 }
 
 
 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;
 }
  
 
 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 = ""
    ;
   
  $res = $self->_filePutContents($file, $data);
  return $res;
 }
  
  
 
 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;
 } 
  
 
 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;
 }
  
 
 protected function _file($id)
 {
  $self = & self::getInstance();
  $fileName = $self->_idToFileName($id);
  return $self->_options['cache_dir'] . $fileName;
 } 
  
 
 protected function _idToFileName($id)
 {
  $self = & self::getInstance();
  $self->_id = $id;
  $prefix = $self->_options['file_name_prefix'];
  $result = $prefix . '---' . $id;
  return $result;
 } 
  
 
 static function test($id)
 {
  $self = & self::getInstance();
  $file = $self->_file($id);
   
  if (!is_file($file)) {
   return false;
  }
   
  return true;
 }
  
 
 protected function _fileGetContents($file)
 {
  if (!is_file($file)) {
   return false;
  }
  return include $file;
 }  
  
  
 static function clear()
 {
  $self = & self::getInstance();
  $self->save('CLEAR_ALL',self::CLEAR_ALL_KEY); 
 } 
  
  
 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

 '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

清空缓存





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


以上就是本文的全部内容，希望对大家的学习有所帮助。