1 <?php
  2 /**
  3  * 加密解密类,PHP加密解密数字，适用于URL加密
  4  * 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。
  5  * @version alpha
  6  * @加密原则 标记长度 + 补位 + 数字替换
  7  * @加密步骤：
  8  * 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
  9  * 1.计算数字长度n,取乱码的第n位作为标记长度。
 10  * 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。
 11  * 3.根据数字替换字符串替换数字，得到数字加密字符串。
 12  * 标记长度字符 + 补位字符串 + 数字加密字符串 = 加密串
 13  * Usage:
 14  *      $obj = new XDeode(9);
 15  *      $e_txt = $obj->encode(123);
 16  *      echo $e_txt.‘<br/>‘;
 17  *      echo $key->decode($e_txt);
 18  */
 19 class XDeode
 20 {
 21     private $strbase = "Flpvf70CsakVjqgeWUPXQxSyJizmNH6B1u3b8cAEKwTd54nRtZOMDhoG2YLrI";
 22     private $key,$length,$codelen,$codenums,$codeext;
 23     function __construct($length = 9,$key = 2543.5415412812){
 24         $this->key = $key;
 25         $this->length = $length;
 26         $this->codelen = substr($this->strbase,0,$this->length);
 27         $this->codenums = substr($this->strbase,$this->length,10);
 28         $this->codeext = substr($this->strbase,$this->length + 10);
 29     }
 30 
 31 
 32     function encode($nums){
 33         $rtn = "";
 34         $numslen = strlen($nums);
 35         //密文第一位标记数字的长度
 36         $begin = substr($this->codelen,$numslen - 1,1);
 37 
 38         //密文的扩展位
 39         $extlen = $this->length - $numslen - 1;
 40         $temp = str_replace(‘.‘, ‘‘, $nums / $this->key);
 41         $temp = substr($temp,-$extlen);
 42 
 43         $arrextTemp = str_split($this->codeext);
 44         $arrext = str_split($temp);
 45         foreach ($arrext as $v) {
 46             $rtn .= $arrextTemp[$v];
 47         }
 48 
 49         $arrnumsTemp = str_split($this->codenums);
 50         $arrnums = str_split($nums);
 51         foreach ($arrnums as $v) {
 52             $rtn .= $arrnumsTemp[$v];
 53         }
 54         return $begin.$rtn;
 55     }
 56 
 57 
 58     function decode($code){
 59 
 60         $begin = substr($code,0,1);
 61         $rtn = ‘‘;
 62         $len = strpos($this->codelen,$begin);
 63         if($len!== false){
 64             $len++;
 65             $arrnums = str_split(substr($code,-$len));
 66             foreach ($arrnums as $v) {
 67                 $rtn .= strpos($this->codenums,$v);
 68             }
 69         }
 70 
 71         return $rtn;
 72     }
 73 }
 74 
 75 $obj = new XDeode(10);
 76 echo $obj->encode(1)."<br/>";
 77 echo $obj->encode(2)."<br/>";
 78 echo $obj->encode(3)."<br/>";
 79 echo $obj->encode(4)."<br/>";
 80 echo $obj->encode(5)."<br/>";
 81 echo $obj->encode(6)."<br/>";
 82 echo $obj->encode(7)."<br/>";
 83 echo $obj->encode(8)."<br/>";
 84 echo $obj->encode(9)."<br/>";
 85 echo $obj->encode(10)."<br/>";
 86 echo $obj->encode(45762454)."<br/>";
 87 echo $obj->encode(1023213123)."<br/>";
 88 echo $obj->encode(134320)."<br/>";
 89 echo ‘<hr/>‘;
 90 
 91 echo $obj->decode(‘FzxxmyQzxV‘)."<br/>";
 92 echo $obj->decode(‘FSSyJzxSSj‘)."<br/>";
 93 echo $obj->decode(‘FmNyixHxNq‘)."<br/>";
 94 echo $obj->decode(‘FQJJzHSSJg‘)."<br/>";
 95 echo $obj->decode(‘FzyQiNziye‘)."<br/>";
 96 echo $obj->decode(‘FizmQyNyzW‘)."<br/>";
 97 echo $obj->decode(‘FNSNSxxJyU‘)."<br/>";
 98 echo $obj->decode(‘FQNHyNJJHP‘)."<br/>";
 99 echo $obj->decode(‘FyiQiimiiX‘)."<br/>";
100 echo $obj->decode(‘lxxmyQzxVk‘)."<br/>";
101 echo $obj->decode(‘CSgeUWjgeg‘)."<br/>";
102 echo $obj->decode(‘aQSSmNHxxzzJJNVkjqjVqVjq‘)."<br/>";
103 echo $obj->decode(‘7ziiVqgqjk‘)."<br/>";
104 
105 //FzxxmyQzxV
106 //FSSyJzxSSj
107 //FmNyixHxNq
108 //FQJJzHSSJg
109 //FzyQiNziye
110 //FizmQyNyzW
111 //FNSNSxxJyU
112 //FQNHyNJJHP
113 //FyiQiimiiX
114 //lxxmyQzxVk
115 //CSgeUWjgeg
116 //aQSSmNHxxzzJJNVkjqjVqVjq
117 //7ziiVqgqjk
118 //1
119 //2
120 //3
121 //4
122 //5
123 //6
124 //7
125 //8
126 //9
127 //10
128 //45762454
129 //1023213123
130 //134320