php实现base64的编码和解码

2. class encryptCalss
3. {
4. var $key=12;
5. function encode($txt){
6. for($i=0;$i $txt[$i]=chr(ord($txt[$i])+$this->key);
7. }
8. return $txt=urlencode(base64_encode(urlencode($txt)));
9. }
10. function decode($txt){
11. $txt=urldecode(base64_decode($txt));
12. for($i=0;$i $txt[$i]=chr(ord($txt[$i])-$this->key);
13. }
14. return $txt;
15. }
16. }
17. ?>

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