PHPÊý×Ö¼ÓÃܽâÃÜÀà

<?php
/* ----------------------------------------------------------------------------
* Script Name: encrypt.php
* Creation Date: 2008-4-7 10:36
* Last Modified: 2008-4-12 16:00
* Author: meyu
* Copyright (c) 2007
* Purpose: Êý×Ö×Ö·û´®¼òÒ×¼Ó½âÃÜ
* ----------------------------------------------------------------------------*/
class Encryption {
/**
* ×îÖÕµÄÃÜÎÄ´úÂ룬¿ÉÉèΪÈÎÒâ²»Öظ´µÄ10λӢÎÄ×Ö·ûa-zA-Z
*/
private $replacement = 'urskydMeIV';
/**
* Ôö¼ÓµÄÃÜÎĵÚһ룬¿ÉÉèΪ1λ³ý0ÒÔÍâµÄÕûÊý£¬¼´ 1-9
*/
private $prefix = "8";
/**
* ¹«Ô¿,³¤¶ÈСÓÚ8λµÄÕýÕûÊý
*/
private $match = "111111";
/**
* ת»»ºó¶ÔÕÕÊý×é
*/
private $replaceenc;
private $replacedec;
function __construct() {
for($i =0; $i < 10; $i++) {
$this->replaceenc['/'.$i.'/'] = $this->replacement{$i};
$this->replacedec['/'.$this->replacement{$i}.'/'] = $i;
}
}
public function encrypt($str) {
return preg_replace(
array_keys($this->replaceenc),
$this->replaceenc,
$this->mynotin(preg_replace("/(.)(.)/", "${2}${1}", $str))
);
}
public function decrypt($str) {
return preg_replace("/(.)(.)/", "${2}${1}",
$this->mynotout(preg_replace(array_keys($this->replacedec),$this->replacedec,$str))
);
}
private function mynotin($str) {
$str_out = "";
$i = 0;
while(isset($str{7*$i})) {
$str_out .= (($this->prefix.substr($str, $i*7, 7))+0)^$this->match;
$i++;
}
return $str_out;
}
private function mynotout($str) {
$str_out = "";
$i = 0;
while(isset($str{8*$i})) {
$str_out .= substr((substr($str, $i*8, 8)+0)^$this->match, 1);
$i++;
}
return $str_out;
}
}
?>