如何使用特定于用户的密钥 - PHP 创建两种编码/解码方法？
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How to create two way encode/decode methods using use-specific key - PHP?
提问by Jason Silberman
I need two functions/methods, one to encode, one to decode. This is not for storing passwords. Each user will have a specific key/salt to encode the data.
我需要两种功能/方法，一种用于编码，一种用于解码。这不是用于存储密码。每个用户都有一个特定的密钥/盐来编码数据。
This is how I would like it to work:
这就是我希望它工作的方式：
function encode($str, $key) {
// something fancy
}
function decode($str, $key) {
// something fancy
}
$key = $logged_in_user->get_key();
$plain = 'abc abc 123 123';
$encoded_data = encode($plain, $key);
// some_fancy_encrypted_data_that_is_really_cooooool
$decoded_data = decode($encoded_data, $key);
// abc abc 123 123
Another thing is that every time I use this function it needs to return the same thing every time I use the encodefunction with the same user key.
另一件事是，每次我使用这个函数时，每次我用encode相同的用户密钥使用该函数时，它都需要返回相同的内容。
How would I do this??
我该怎么做？？
回答by rinchik
$myVarIWantToEncodeAndDecode
Define key (salt, broth etc..): $key = "#&$sdfdfs789fs7d";
定义关键（盐、肉汤等）： $key = "#&$sdfdfs789fs7d";
To encode:
编码：
$encoded = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $myVarIWantToEncodeAndDecode, MCRYPT_MODE_CBC, md5(md5($key))));
To decode:
解码：
$decoded = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($encoded), MCRYPT_MODE_CBC, md5(md5($key))), "##代码##");
Note: mcrypt_decrypt has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.
注意：自 PHP 7.1.0 起，mcrypt_decrypt 已被弃用。强烈建议不要依赖此功能。
