[nerbert]

To store in datastore

require_once(DIR . '/includes/functions.php');
build_datastore('countries', serialize($countries), 1);

You need a plugin in "init_startup"

if(THIS_SCRIPT == 'showthread') // or whatever file reads the array
{
	$datastore_fetch[] = "'countries'";
}

Then the array should be available as $vbulletin->countries

--------------- Added [DATE]1417752544[/DATE] at [TIME]1417752544[/TIME] ---------------

Originally Posted by kh99

Edit : BTW, there's also a function that swaps keys and values, but I can't remember what that one's called either.

array_flip()

http://www.w3schools.com/php/func_array_flip.asp