Simple PHP Cache class sharing

  This article mainly introduces a PHP cache class, file name using MD5 encryption, we refer to the use of the bar

The code is as follows: <?php class cache  { private $dir = "data/cache/";//define Cache directory    private $key = ' c_a_sss ';//filename MD5 encryption key    function Set_dir ($dirpath)  {  $this->dir= $dirpath;   $this->make_dir ($ THIS->DIR); &NBSP}  function Read ($key, $minutes =1)  {  $filename = $this->get_filename ($key);   if ($datas = @file_get_contents ($filename))   {    $datas = Unserialize ($datas);     if (Time ()-$datas [' time] '] < $minutes *60     {     return $datas [' data '];    }  }   return FAL Se &NBSP}    function write ($key, $data)  {    $filename = $this->get_filename ($key);   IF ($handle = fopen ($filename, ' w+ '))   {    $datas = array (' Data ' => $data, ' time ' =>time ());    flock ($handle, LOCK_EX);     $rs = fputs ($handle, serialize ($datas));    flock ($handle, Lock_un);    fclose ($handle);    if ($rs!==false) {return true; &nbsp.}  }   return false; &NBSP}  function Clear_all ()  {  $dir = $this->dir;   $this->del_file ($dir);    nbsp   Private Function Get_filename ($key)  {  return $this->dir. $key. ' _ '. MD5 ($key. $this->key); &NBSP}  private function Make_dir ($path)  {  if (! file_exists ($path))   {    $this ; Make_dir (DirName ($path));    IF (! mkdir ($path, 0777))    die (' Cannot create cache folder '. $path);  } &nbsp  private function Del_file ($dir)  {    if (Is_dir ($dir))     {      $DH =opendir ($dir);//Open Directory//list all files in the directory and remove them. And..      while (false!== ($file = Readdir ($DH)) {      if ($file!= "." && $file!= "..." {      $fullpath = $dir. " /". $file;       if (!is_dir ($fullpath)) {        unlink ($fullpath);     &NBSP} else {        $this->del_file ($fullpath);       }     }   &NBSP}    closedir ($DH);   }   } }   $cache = new Cache ( );   $cache->set_dir (' data/cache_dir/');   $data = $cache->read (' sys ', 1);   if (empty ($data))   {    $data =array (' AA ' =>1111, ' BB ' =>2222, ' Date ' =>date (' y-m-d h:i:s ') );     $cache->write (' sys ', $data);   }   Print_r ($data);