Why isn't my PHP SHA256 hash equivalent to C# SHA256Managed hash

Question

Why aren\'t these the same?

php:

    $hash = hash(\'sha256\', $userData[\'salt\'] . hash(\'sha256\', $password) );

c#

Answer 1

Because they're different. Your C# code encodes the computed hash in Base64 encoding at the end. PHP just returns a string of hexadecimal digits.