Merge pull request chriskacerguis#379 from m7moud/master

Fix the check if a file extension is used

Author: chriskacerguis

application/libraries/REST_Controller.php

@@ -565,7 +565,7 @@ protected function _detect_output_format()
         }
 
         // Check if a file extension is used
-        elseif ($this->_get_args and !is_array(end($this->_get_args)) and preg_match($pattern, end($this->_get_args), $matches)) {
+        elseif ($this->_get_args and !is_array(end($this->_get_args)) and preg_match($pattern, end(array_keys($this->_get_args)), $matches)) {
             // The key of the last argument
             $last_key = end(array_keys($this->_get_args));