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<?php
/----------------------------------------------------------------------------
ScriptName:encrypt.php
CreationDate:2008-4-710:36
LastModified:2008-4-1216:00
Author:meyu
Copyright(c)2007
Purpose:数字字符串简易加解密
----------------------------------------------------------------------------*/ classEncryption{
/
最终的密文代码，可设为任意不重复的10位英文字符a-zA-Z
/
private$replacement='urskydMeIV'; /
增加的密文第一位，可设为1位除0以外的整数，即1-9
/
private$prefix="8"; /
公钥,长度小于8位的正整数
/
private$match="222221"; /
转换后对照数组
/
private$replaceenc;
private$replacedec; function__construct(){
for($i=0;$i<10;$i++){
$this->replaceenc['/'.$i.'/']=$this->replacement{$i};
$this->replacedec['/'.$this->replacement{$i}.'/']=$i;
}
} publicfunctionencrypt($str){
returnpreg_replace(
array_keys($this->replaceenc),
$this->replaceenc,
$this->mynotin(preg_replace("/(.)(.)/","${2}${1}",$str))
);
} publicfunctiondecrypt($str){
returnpreg_replace("/(.)(.)/",
$this->mynotout(preg_replace(array_keys($this->replacedec),$this->replacedec,$str))
);
} privatefunctionmynotin($str){
$str_out="";
$i=0;
while(isset($str{7$i})){
$str_out.=(($this->prefix.substr($str,$i7,7))+0)^$this->match;
$i++;
}
return$str_out;
} privatefunctionmynotout($str){
$str_out="";
$i=0;
while(isset($str{8$i})){
$str_out.=substr((substr($str,$i8,8)+0)^$this->match,1);
$i++;
}
return$str_out;
}
}
?> （编辑：李大同）
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