PHP可逆加密/解密函数分享

functionencrypt($data,$key){
$prep_code=serialize($data);
$block=mcrypt_get_block_size("des","ecb");
if(($pad=$block-(strlen($prep_code)%$block))<$block){
$prep_code.=str_repeat(chr($pad),$pad);
}
$encrypt=mcrypt_encrypt(MCRYPT_DES,$key,$prep_code,MCRYPT_MODE_ECB);
returnbase64_encode($encrypt);
}

functiondecrypt($str,$key){
$str=base64_decode($str);
$str=mcrypt_decrypt(MCRYPT_DES,$key,$str,MCRYPT_MODE_ECB);
$block=mcrypt_get_block_size("des","ecb");
$pad=ord($str[($len=strlen($str))-1]);
if($pad&&$pad<$block&&preg_match("/".chr($pad)."{".$pad."}$/",$str)){
$str=substr($str,0,strlen($str)-$pad);
}
returnunserialize($str);
}