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<?php
namespace B2\Modules\Common;
/**
* 加密解密类
* 该算法仅支持加密数字。比较适用于数据库中id字段的加密解密，以及根据数字显示url的加密。
* @author 深秋的竹子
* @email 81254648@qq.com
* @version alpha
* @加密原则 标记长度 + 补位 + 数字替换
* @加密步骤：
* 将a-z,A-Z,0-9 62个字符打乱，取前M(数字最大的位数)位作为 标记长度字符串，取第M+1 到第M+10位为数字替换字符串，剩余的为补位字符串
* 1.计算数字长度n,取乱码的第n位作为标记长度。
* 2.计算补位的长度，加密串的长度N -1 - n 为补位的长度。根据指定的算法得到补位字符串。
* 3.根据数字替换字符串替换数字，得到数字加密字符串。
* 标记长度字符 + 补位字符串 + 数字加密字符串 = 加密串
* Usage:
* $obj = new XDeode(9);
* $e_txt = $obj->encode(123);
* echo $e_txt.'<br/>';
* echo $key->decode($e_txt);
*/
class IntCode
{
private $strbase = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
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 $v) {
if (!is_numeric($v))
return $nums;
$rtn .= $arrextTemp[$v];
}
$arrnumsTemp = str_split($this->codenums);
$arrnums = str_split($nums);
foreach ($arrnums as $v) {
if (strpos($this->strbase, $v) == false)
return $nums;
$rtn .= $arrnumsTemp[$v];
}
return $begin . $rtn;
}
function decode($code)
{
$begin = substr($code, 0, 1);
$rtn = '';
if ($begin) {
$len = strpos($this->codelen, $begin);
if ($len !== false) {
$len++;
$arrnums = str_split(substr($code, -$len));
foreach ($arrnums as $v) {
$rtn .= strpos($this->codenums, $v);
}
}
}
return $rtn;
}
}