php 自定义加密、解密方法

/**
*  加密
* @param  [type] $code [description]
* @return [type]       [description]
*/
public static function encrypt($code){
return urlencode(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5("key"), $code, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}
/**
* 解密
* @param  [type] $code [description]
* @return [type]       [description]
*/
public static function decrypt($code){
return urldecode(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5("key"), base64_decode($code), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
}

调用：

$id=$this->encrypt($id);

$id=$this->decrypt($id);