<?php
error_reporting(E_ALL);

class fileCacheException extends Exception{

}

//Key-Value型文件存储
class fileCache{
     private $_file_header_size = 14;
     private $_file_index_name;
     private $_file_data_name;
     private $_file_index;//索引文件句柄
     private $_file_data;//数据文件句柄
     private $_node_struct;//索引结点结构体
     private $_inx_node_size = 36;//索引结点大小

     public function __construct($file_index="filecache_index.dat", $file_data="filecache_data.dat"){
          $this->_node_struct = array(
               'next'=>array(1, 'V'),
               'prev'=>array(1, 'V'),
              'data_offset'=>array(1,'V'),//数据存储起始位置
              'data_size'=>array(1,'V'),//数据长度
              'ref_count'=>array(1,'V'),//引用此处，模仿PHP的引用计数销毁模式
              'key'=>array(16,'H*'),//存储KEY
          );

          $this->_file_index_name = $file_index;
          $this->_file_data_name = $file_data;

          if(!file_exists($this->_file_index_name)){
               $this->_create_index();
          }else{
               $this->_file_index = fopen($this->_file_index_name, "rb+");
          }

          if(!file_exists($this->_file_data_name)){
               $this->_create_data();
          }else{
               $this->_file_data = fopen($this->_file_data_name, "rb+");//二进制存储需要使用b
          }
     }

     //创建索引文件
     private function _create_index(){
          $this->_file_index = fopen($this->_file_index_name, "wb+");//二进制存储需要使用b
          if(!$this->_file_index) 
               throw new fileCacheException("Could't open index file:".$this->_file_index_name);

          $this->_index_puts(0, '<'.'?php exit()?'.'>');//定位文件流至起始位置0, 放置php标记防止下载
          $this->_index_puts($this->_file_header_size, pack("V1", 0));
     }


     //创建存储文件
     private function _create_data(){
          $this->_file_data = fopen($this->_file_data_name, "wb+");//二进制存储需要使用b
          if(!$this->_file_index) 
               throw new fileCacheException("Could't open index file:".$this->_file_data_name);

          $this->_data_puts(0, '<'.'?php exit()?'.'>');//定位文件流至起始位置0, 放置php标记防止下载
     }

     private function _index_puts($offset, $data, $length=false){
          fseek($this->_file_index, $offset);

          if($length)
          fputs($this->_file_index, $data, $length);
          else
          fputs($this->_file_index, $data);
     }

     private function _data_puts($offset, $data, $length=false){
          fseek($this->_file_data, $offset);
          if($length)
          fputs($this->_file_data, $data, $length);
          else
          fputs($this->_file_data, $data);
     }

     /**
     * 文件锁
     * @param $is_block 是否独占、阻塞锁
     */
     private function _lock($file_res, $is_block=true){
          flock($file_res, $is_block ? LOCK_EX : LOCK_EX|LOCK_NB);
     }

     private function _unlock($file_res){
          flock($file_res, LOCK_UN);
     }

     public function add($key, $value){
          $key = md5($key);
          $value = serialize($value);
          $this->_lock($this->_file_index, true);
          $this->_lock($this->_file_data, true);

          fseek($this->_file_index, $this->_file_header_size);

          list(, $index_count) = unpack('V1', fread($this->_file_index, 4));

          $data_size = filesize($this->_file_data_name);

          fseek($this->_file_data, $data_size);

          $value_size = strlen($value);

          $this->_data_puts(filesize($this->_file_data_name), $value);

          $node_data = 
          pack("V1V1V1V1V1H32", ($index_count==0) ? 0 : $index_count*$this->_inx_node_size, 0, filesize($this->_file_data_name), strlen($value), 0, $key);

          $index_count++;

          $this->_index_puts($this->_file_header_size, $index_count, 4);

          $this->_index_puts($this->get_new_node_pos($index_count), $node_data);

          $this->_unlock($this->_file_data);
          $this->_unlock($this->_file_index);
     }

     public function get_new_node_pos($index_count){
          return $this->_file_header_size + 4 + $this->_inx_node_size * ($index_count-1);
     }

     public function get_node($key){
          $key = md5($key);
          fseek($this->_file_index, $this->_file_header_size);
          $index_count = fread($this->_file_index, 4);

          if($index_count>0) {
               for ($i=0; $i < $index_count ; $i++) { 
                    fseek($this->_file_index, $this->_file_header_size + 4 + $this->_inx_node_size * $i);
                    $data = fread($this->_file_index, $this->_inx_node_size);
                    $node = unpack("V1next/V1prev/V1data_offset/V1data_size/V1ref_count/H32key", $data);

                    if($key == $node['key']){
                         return $node;
                    }
               }
          }else{
               return null;
          }
     }

     public function get_data($offset, $length){
          fseek($this->_file_data, $offset);
          return unserialize(fread($this->_file_data, $length));
     }
}

//使用方法
$cache = new fileCache();
$cache->add('abcdefg' , 'testabc');
$data = $cache->get_node('abcdefg');
print_r($data);
echo $cache->get_data($data['data_offset'], $data['data_size']);

$LOGIN = array(
     'COMMAND'=>array('a30', 'LOGIN'),
     'DATA'=>array('a30', 'HELLO')
);

$LOGOUT = array(
     'COMMAND'=>array('a30', 'LOGOUT'),
     'DATA'=>array('a30', 'GOOD BYE')
);

$LOGIN_SUCCESS = array(
     'COMMAND'=>array('a30', 'LOGIN_SUCCESS'),
     'DATA'=>array('V1', 1)
);

$LOGOUT_SUCCESS = array(
     'COMMAND'=>array('a30', 'LOGIN_SUCCESS'),
     'DATA'=>array('V1', time())
);

<?php
class Byte{
    //长度
    private $length=0;
    
    private $byte='';
    //操作码
    private $code;
    public function setBytePrev($content){
        $this->byte=$content.$this->byte;
    }
    public function getByte(){
        return $this->byte;
    }
    public function getLength(){
        return $this->length;
    }
    public function writeChar($string){
        $this->length+=strlen($string);
        $str=array_map('ord',str_split($string));
        foreach($str as $vo){
            $this->byte.=pack('c',$vo);
        }
        $this->byte.=pack('c','0');
        $this->length++;
    }
    public function writeInt($str){
        $this->length+=4;
        $this->byte.=pack('L',$str);
    }
    public function writeShortInt($interge){
        $this->length+=2;
        $this->byte.=pack('v',$interge);
    }
}
class GameSocket{
    private $socket;
    private $port=9991;
    private $host='192.168.211.231';
    private $byte;
    private $code;
    const CODE_LENGTH=2;
    const FLAG_LENGTH=4;
    public function __set($name,$value){
        $this->$name=$value;
    }
    public function __construct($host='192.168.211.231',$port=9991){
        $this->host=$host;
        $this->port=$port;
        $this->socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        if(!$this->socket){
            exit('创建socket失败');
        }
        $result = socket_connect($this->socket,$this->host,$this->port);
        if(!$result){
            exit('连接不上目标主机'.$this->host);
        }
        $this->byte=new Byte();
    }
    public function write($data){
        if(is_string($data)||is_int($data)||is_float($data)){
            $data[]=$data;
        }
        if(is_array($data)){
            foreach($data as $vo){
                $this->byte->writeShortInt(strlen($vo));
                $this->byte->writeChar($vo);
            }
        }