Index: library/Zend/Db/Statement/Mysqli.php
===================================================================
--- library/Zend/Db/Statement/Mysqli.php	(revision 13376)
+++ library/Zend/Db/Statement/Mysqli.php	(working copy)
@@ -198,7 +198,22 @@
         }
         // send $params as input parameters to the statement
         if ($params) {
-            array_unshift($params, str_repeat('s', count($params)));
+           $types='';
+
+            //iterate the parameters to figure out their type
+            foreach ($params as $value) {
+                if (is_int($value)) {
+                    $types .= 'i';
+                }
+                else if (is_double($value)) {
+                    $types .= 'd';
+                }
+                else if (is_string($value)) {
+                    $types .= 's';
+                }
+            }
+
+            array_unshift($params, $types);
             call_user_func_array(
                 array($this->_stmt, 'bind_param'),
                 $params