How to use $language array in region--header.tpl.php I am using Language Switcher Dropdown module for language selection. 

Successfully implemented this module and also get $language array properly in page.tpl.php file based on language selection.

But I am not able to get $language array in region--header.tpl.php file.

So how can I use this array in region files ?
$language; is a global variable in drupal 7. You can get this variable in region--header.tpl.php as shown below:

global $language;