Add support for attributes as an object

Fixed:
- Lack of support for objects as affirmed in the README.

Author: mcaskill

Function.HTML-Build-Attributes.php

@@ -4,14 +4,19 @@
     /**
      * Generate a string of HTML attributes
      *
-     * @param  array         $attr     Associative array of attribute names and values.
+     * @param  array|object  $attr     Associative array or object of attribute names and values.
      * @param  callable|null $callback Callback function to escape values for HTML attributes.
      *                                 Defaults to `htmlspecialchars()`.
-     * @return string Returns a string of HTML attributes.
+     * @return string Returns a string of HTML attributes
+     *     or a empty string if $attr is invalid or empty.
      */
-    function html_build_attributes(array $attr, callable $callback = null)
+    function html_build_attributes($attr, callable $callback = null)
     {
-        if (!count($attr)) {
+        if (is_object($attr) && !($attr instanceof \Traversable)) {
+            $attr = get_object_vars($attr);
+        }
+
+        if (!is_array($attr) || !count($attr)) {
             return '';
         }