一个PHP针对数字的加密解密类

            [U]复制代码[/U] 代码如下:
encode(123);
*   echo $e_txt.'
';
*   echo $key->decode($e_txt);
*/
class XDeode{
  private $strbase = "Flpvf70CsakVjqgeWUPXQxSyJizmNH6B1u3b8cAEKwTd54nRtZOMDhoG2YLrI";
  private $key,$length,$codelen,$codenums,$codeext;
  function __construct($length = 9,$key = 2543.5415412812){
    $this->key = $key;
    $this->length = $length;
    $this->codelen = substr($this->strbase,0,$this->length);
    $this->codenums = substr($this->strbase,$this->length,10);
    $this->codeext = substr($this->strbase,$this->length + 10);
  }

  function encode($nums){
    $rtn = "";
    $numslen = strlen($nums);
    //密文第一位标记数字的长度
    $begin = substr($this->codelen,$numslen - 1,1);
    //密文的扩展位
    $extlen = $this->length - $numslen - 1;
    $temp = str_replace('.', '', $nums / $this->key);
    $temp = substr($temp,-$extlen);
    $arrextTemp = str_split($this->codeext);
    $arrext = str_split($temp);
    foreach ($arrext as $v) {
      $rtn .= $arrextTemp[$v];
    }
    $arrnumsTemp = str_split($this->codenums);
    $arrnums = str_split($nums);
    foreach ($arrnums as $v) {
      $rtn .= $arrnumsTemp[$v];
    }
    return $begin.$rtn;
  }
  function decode($code){
    $begin = substr($code,0,1);
    $rtn = '';
    $len = strpos($this->codelen,$begin);
    if($len!== false){
      $len++;
      $arrnums = str_split(substr($code,-$len));
      foreach ($arrnums as $v) {
        $rtn .= strpos($this->codenums,$v);
      }
    }
    return $rtn;
  }
}
/**** 示例  ****/
$begin = 9950;
$end = $begin + 50;
$obj = new XDeode(9);
for($i=$begin;$iencode($i);
  $de = $obj->decode($en);
  echoln("[{$i}]=[{$en}]=[{$de}]");
}
function echoln($str){
  echo "{$str}
";
}
?>
运行示例结果：
[9950]=[vmizxPPga]=[9950]
[9951]=[vSNSSPPgk]=[9951]
[9952]=[vNQNyPPgV]=[9952]
[9953]=[vyyJJPPgj]=[9953]
[9954]=[vNzQzPPgq]=[9954]
[9955]=[vyNzmPPgg]=[9955]
[9956]=[vXxSNPPge]=[9956]
[9957]=[vXJJJPPgW]=[9957]
[9958]=[vXziQPPgU]=[9958]
[9959]=[viXxSPPgP]=[9959]
[9960]=[vQxmyPPea]=[9960]
[9961]=[viJyJPPek]=[9961]
            
            
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