海运的博客

对于安全性要求不高的情况下足够用了，性能从高到低的两种实现：

<?php
   function xor_enc($string, $operation, $key = 'abcdf') {
      $string = $operation == 'ENCODE' ? $string : base64_decode($string);
      $len1 = strlen($string);
      $len2 = strlen($key);
      if($len1 > $len2) $key = str_repeat($key, ceil($len1 / $len2));
      $string = $operation == 'ENCODE' ? base64_encode($string ^ $key) : $string ^ $key;
      return $string;
   }
?>

   function xor_enc($string, $operation = 'ENCODE', $key = 'abcd') {
      $txt = $operation == 'ENCODE' ? $string : base64_decode($string);
      $len = strlen($key);
      $code = '';
      for ($i = 0; $i < strlen($string); $i ++) {
         $k = $i % $len;
         $code .= $string [$i] ^ $key [$k];
      }
      $code = $operation == 'ENCODE' ? base64_encode($code) : $code;
      return $code;
   }

<?php
   function genstr($num)   
   {  
      for ($i = 0; $i <= $num; $i++)  
      {  
         $str .= chr(mt_rand(97, 122));  
      }  
      return $str;  
   }  

   function geenstr($num) {
      return substr(str_shuffle('abcdefghijklmnopqrstuvwxyz'), 0, $num);
   }

   echo genstr(6); 
?>

UTF-8：

<?php
   function genstr($num)
   {
      for($i=0;$i<=$num;$i++)
      {
         $str .= '&#'.rand(19968, 40869).';';
      }

      return mb_convert_encoding($str, "UTF-8", "HTML-ENTITIES");
   }
   echo genstr(mt_rand(1,8));
?>

GBK：

<?php
   function genstr($num)
   {
      for($i=0;$i<=$num;$i++)
      {
         $str .= chr(rand(0xB0,0xF7)).chr(rand(0xA1,0xFE));
      }

      return $str;
   }
   echo genstr(mt_rand(1,8));
?>

#!/usr/bin/python
# -*- coding: utf-8 -*-  
from time import time
start = time()
stop = time()
print("程序执行时间"+str(stop-start) + "秒")

#!/bin/bash
start=`date +%s`
stop=`date +%s`
echo "程序执行时间$[ stop - start ]秒"