What is the PHP equivalent of this C# encoding code?

Question

I want to turn the following C# code into PHP. The C# is: ``` byte[] operation = UTF8Encoding.UTF8.GetBytes("getfaqs"); byte[] secret = UTF8Encoding.UTF8.GetBytes("Password"); var hmac = newHMACSHA256(secret); byte[] hash = hmac.ComputeHash(operation); ``` Which I've turned into this: ``` $hash = hash_hmac( "sha256", utf8_encode("getfaqs"), utf8_encode("Password")); ``` Then I have: ``` var apiKey = "ABC-DEF1234"; var authInfo = apiKey + ":" + hash //base64 encode the authorisation info var authorisationHeader = Convert.ToBase64String(Encoding.UTF8.GetBytes(authInfo)); ``` Which I think should be: ``` $authInfo = base64_encode($apiKey . ":" . $hash); ``` Or ``` $authInfo = base64_encode(utf8_encode($apiKey . ":" . $hash)); ``` But not certain, notice this second encoding uses Encoding.UTF8, not UTF8Encoding.UTF8. What should the PHP code look like?

Accepted Answer

PHP strings are already (kind of) `byte[]`, php doesn't have any encoding awareness. `utf8_encode` actually turns ISO-8859-1 to UTF-8, so it's not needed here.

If those strings are literals in your file, that file just needs to be saved in UTF-8 encoding.

Pass `true` to `hash_hmac` as 4th parameter and remove those `utf8_encode` calls:

```
$hash = hash_hmac( "sha256", "getfaqs", "Password", true );
```

Also, string concatenation operator is `.`, so :

```
$authInfo = base64_encode($apiKey . ":" . $hash);
```

What is the PHP equivalent of this C# encoding code?

Solution

Problem