php加解密怎么做

基于这几个函数可逆转的加密为：base64_encode()、urlencode()相对应的解密函数：base64_decode() 、urldecode() ，示例如下:

1、第一种加密解密算法

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2、第二种解密解密算法

<?php   //加密函数  function lock_url($txt,$key='www.xxxx.com'){      $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";      $nh = rand(0,64);      $ch = $chars[$nh];      $mdKey = md5($key.$ch);      $mdKey = substr($mdKey,$nh%8, $nh%8+7);      $txt = base64_encode($txt);      $tmp = '';      $i=0;$j=0;$k = 0;      for ($i=0; $i<strlen($txt); $i++) {          $k = $k == strlen($mdKey) ? 0 : $k;          $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;          $tmp .= $chars[$j];      }      return urlencode($ch.$tmp);  }  //解密函数  function unlock_url($txt,$key='www.xxxx.com'){      $txt = urldecode($txt);      $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";      $ch = $txt[0];      $nh = strpos($chars,$ch);      $mdKey = md5($key.$ch);      $mdKey = substr($mdKey,$nh%8, $nh%8+7);      $txt = substr($txt,1);      $tmp = '';      $i=0;$j=0; $k = 0;      for ($i=0; $i<strlen($txt); $i++) {          $k = $k == strlen($mdKey) ? 0 : $k;          $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);          while ($j

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3、第三种加密解密算法

<?php   //改进后的算法  //加密函数  function lock_url($txt,$key='test'){      $txt = $txt.$key;      $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";      $nh = rand(0,64);      $ch = $chars[$nh];      $mdKey = md5($key.$ch);      $mdKey = substr($mdKey,$nh%8, $nh%8+7);      $txt = base64_encode($txt);      $tmp = '';      $i=0;$j=0;$k = 0;      for ($i=0; $i<strlen($txt); $i++) {          $k = $k == strlen($mdKey) ? 0 : $k;          $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;          $tmp .= $chars[$j];      }      return urlencode(base64_encode($ch.$tmp));  }  //解密函数  function unlock_url($txt,$key='test'){      $txt = base64_decode(urldecode($txt));      $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";      $ch = $txt[0];      $nh = strpos($chars,$ch);      $mdKey = md5($key.$ch);      $mdKey = substr($mdKey,$nh%8, $nh%8+7);      $txt = substr($txt,1);      $tmp = '';      $i=0;$j=0; $k = 0;      for ($i=0; $i<strlen($txt); $i++) {          $k = $k == strlen($mdKey) ? 0 : $k;          $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);          while ($j

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对于不同需要，可以使用不同加密解密算法。

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