Checkout: Filter - checkout_currencies Example

gistfile1.php

function currencies($currencies = array()) {
	// remove a currency...
	unset($currencies['AUD']);
	
	// add a custom currency...
	$currencies['USD'] = array(
		'name'		=>	'US Dollar',
		'symbol'	=>	'$',
	);
	
	return $currencies;
}

add_filter('checkout_currencies', 'currencies', 10, 1);