Insert Post Hook

function my_update_post_categories( $post_id )
{
	if ( wp_is_post_revision( $post_id ) )
		return;

    $Categories = wp_get_post_categories( $post_id );

	foreach($Categories as $c)
		{
		$cat = get_category($c);
		$CategoryNames[] = $cat->name;
		}

	// SBC Travel Category Merge
	$TravelCategories	=	array("Travel","Travel News","Travel/Tourism");
		
	if (count(array_intersect($TravelCategories, $CategoryNames)) === 0)
		{
		// No values from array1 are in array 2
		}
	else
		{
		$newcat    = get_term_by( 'name', 'myTravelNews', 'category' );
		wp_set_post_categories( $post_id, $newcat->term_id, true);
		}
}