Adding header options to add

Author: mcocaro

Authentication/JWT.php

@@ -119,17 +119,21 @@ public static function decode($jwt, $key = null, $allowed_algs = array())
      * @param string       $key     The secret key
      * @param string       $alg     The signing algorithm. Supported
      *                              algorithms are 'HS256', 'HS384' and 'HS512'
+     * @param array        $head    An array with header elements to attach
      *
      * @return string      A signed JWT
      * @uses jsonEncode
      * @uses urlsafeB64Encode
      */
-    public static function encode($payload, $key, $alg = 'HS256', $keyId = null)
+    public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)
     {
         $header = array('typ' => 'JWT', 'alg' => $alg);
         if ($keyId !== null) {
             $header['kid'] = $keyId;
         }
+        if ( isset($head) && is_array($head) ) {
+            array_push($header, $head);
+        }
         $segments = array();
         $segments[] = JWT::urlsafeB64Encode(JWT::jsonEncode($header));
         $segments[] = JWT::urlsafeB64Encode(JWT::jsonEncode($payload));