Changes

|Creates a message authentication code via a cryptographic hash function and a secret key. <br/><code>$encoding</code> must either be <code>hex</code>, <code>base64</code> or the empty string (default is <code>base64</code>) and specifies the encoding of the returned authentication code.<b>Default is <code>base64</code></b><br/><code>$algorithm</code> describes the hash algorithm which is used for encryption. Currently supported are <code>md5</code>, <code>sha1</code>, <code>sha256</code>, <code>sha384</code>, <code>sha512</code>.