<?php

 function keyED($txt,$encrypt_key) //定义一个keyED

 {

     $encrypt_key =    md5($encrypt_key);

     $ctr=0;

     $tmp = '';

     for($i=0;$i<strlen($txt);$i++)

     {

         if ($ctr==strlen($encrypt_key))

         $ctr=0;

         $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);

         $ctr++;

     }

     return $tmp;

 }

 function encrypt($txt,$key)

 {

     $encrypt_key = md5(mt_rand(0,100));

     $ctr=0;

     $tmp = '';

      for ($i=0;$i<strlen($txt);$i++)

      {

         if ($ctr==strlen($encrypt_key))

             $ctr=0;

         $tmp.=substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));

         $ctr++;

      }

      return keyED($tmp,$key);

 }

 function decrypt($txt,$key)

 {

     $txt = keyED($txt,$key);

     $tmp = '';

     for($i=0;$i<strlen($txt);$i++)

     {

         $md5 = substr($txt,$i,1);

         $i++;

         $tmp.= (substr($txt,$i,1) ^ $md5);

     }

     return $tmp;

 }

 function encrypt_url($url,$key)

 {

     return rawurlencode(base64_encode(encrypt($url,$key)));

 }

 function decrypt_url($url,$key)

 {

     return decrypt(base64_decode(rawurldecode($url)),$key);

 }

 function geturl($str,$key)

 {

     $str = decrypt_url($str,$key);

     $url_array = explode('&',$str);

     if (is_array($url_array))

     {

         foreach ($url_array as $var)

         {

             $var_array = explode('=',$var);

             $vars[$var_array[0]]=$var_array[1];

         }

     }

     return $vars;

 }

 ?>

 $key = "key";

 //生产加密参数地址

 for ($i=0;$i<10;$i++)

 {

     $url=encrypt_url('id=$i&sdf=asdf',$key);

     echo "<a href=?url=".$url.">php技术文章$i</a><br>";

 }

 //获取参数地址

 $get = geturl($_GET['url'],$key);

 var_dump($get);