<?php

/*

$cache_set = array(

//缓存路径 , 最后要加"/"

'cacheRoot'=>'./cache/',

//缓存时间

'cacheTime'=>20,

//cache type

'cacheType'=>1,

//扩展名

'cacheExe'=>'.php'

);

$cache = new Cache($cache_set);

$a=array('1','2');

$a="aaa";

$b='';

if($cache->cache_is("d")){

 $c=$cache->cache_read("d");

 echo "c";

 print_r($c);

}else {

$b=$cache->cache_data('d',$a);

}

print_r($b);

//$cache->clear("a");

//echo $cache->cache_read("./cache/d.php");

//echo $d;

*/

/**

 * 数据缓存类 v1.0

 * @author shooke

 * 2009-11-13 16:02:26

 * 用于缓存数据,如变量,但不能缓存页面

 */

class Cache{

 //配置

 public $config = array(

 //缓存路径

 'cacheRoot'=>'./cache/',

 //缓存时间

 'cacheTime'=>1,

 //cache 类型 1串化数据 2变量

 'cacheType'=>2,

 //扩展名

 'cacheExe'=>'.php'

 //转换中间变量

 );

 public $return_name=array();

 function __construct($cache_set = array())

 {

  if(!empty($cache_set)) $this->config=array_merge($this->config,$cache_set);

  $this->config['ClassName'] = __CLASS__;

 }

 public function clear($filename=''){

  if (file_exists($this->cache_file($filename))) {

   @unlink($this->cache_file($filename));

  }elseif (empty($filename)){

   $this->clear_dir($this->config['cacheRoot']);

  }else{

   $this->clear_dir($this->config['cacheRoot'].$filename);

   echo $this->config['cacheRoot'].$filename;

  }

 }

 //循环删除路径

 private function clear_dir($dir,$to = false)

 {

  if ($list = glob($dir.'/*'))

  {

   foreach ($list as $file)

   {

    is_dir($file) ? $this->clear_dir($file) : unlink($file);

   }

  }

  if ($to === false) rmdir($dir);

 }

 //写入缓存

 private function cache_write($filename, $writetext, $openmod='w'){

  if (!file_exists($filename)) {

   @$this->makeDir( dirname($filename ));

  }

  if(@$fp = fopen($filename, $openmod)) {

   flock($fp, 2);

   fwrite($fp, $writetext);

   fclose($fp);

   return true;

  } else {

   echo "File: $filename write error.";

   return false;

  }

 }

 //缓存有效期 有效返回 true

 public function cache_is($fileName){

  $fileName=$this->cache_file($fileName);

  if( file_exists( $fileName ) ) {

   //如果缓存时间为负数则永不过期

   if ($this->config['cacheTime'] < 0) {

    return true;

   }

   //如果缓存时间为0则一直过期

   if ($this->config['cacheTime'] == 0) {

    return false;

   }

   //获取缓存文件的建立时间

   $ctime = intval(filemtime( $fileName ));

   //比较是否大于缓存时间,是则过期 否则不过期

   if (time() - $ctime > $this->config['cacheTime']) {

    return false;

   }else {

    return true;

   }

   //文件不存在视为过期失效

  }else {

   return false;

  }

 }

 public function cache_data($name,$data){

  $varname=$name;

  $name = $this->cache_file($name);

  //config['cacheTime']==0也就是不启用缓存是直接返回数据

  if ($this->config['cacheTime'] <> 0) {

   if($this->config['cacheType']==1){

    $write_data = "<?php exit;?>".serialize($data);

    //return $data;

   }else {

    $write_data = "<?php\\r\\n\\$var= ";

    $write_data .= var_export($data,true);

    $write_data .=";\\r\\n?>";

   }

   $this->cache_write($name,$write_data);

  }

  return $data;

 }

 //缓存文件名

 private function cache_file($filename){

  return $this->config['cacheRoot'].$filename.$this->config['cacheExe'];

 }

 //读取文件

 public function cache_read($file){

  $file=$this->cache_file($file);

  if (!file_exists($file)) {

   return '';

  }

  if($this->config['cacheType']==1){

   if (function_exists('file_get_contents')){

    $cache_Content= file_get_contents($file);

   }else{

    $fopen = fopen($file,'r');

    $cache_Content = '';

    do {

     $data = fread($fopen,filesize($file));

     if (strlen($data)===0) break;

     $cache_Content .= $data;

    }while(1);

    fclose($fopen);

   }

   $cache_Content = substr($cache_Content,13);/* 去除<?php exit;?> */

   $cache_Content = unserialize($cache_Content);

   return $cache_Content;

  }else{

   include_once($file);

   return $var;

  }

 }

 //循环创建目录

 private function makeDir( $dir, $mode = 0777 ) {

  if( ! $dir ) return 0;

  $dir = str_replace( "\\\\", "/", $dir );

  $mdir = "";

  foreach( explode( "/", $dir ) as $val ) {

   $mdir .= $val."/";

   if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;

   if( ! file_exists( $mdir ) ) {

    if(!@mkdir( $mdir, $mode )){

     return false;

    }

   }

  }

  return true;

 }

}

?>