Array of Countries, Indexed by Continent

For a recent commit, I needed an array of 2-digit countries codes split up by their continent. There’s some examples already out there, but I wasn’t too confident about their accuracy, so I ended up writing my own.

Here it is in case it’s useful to anyone else.

 * Get a list of ISO-3166-2 countries by continent.
 * Data was sourced from on 2020-04-17.
 * @param string $continent
 * @return array
function get_iso_3166_2_country_codes( $continent = '' ) {
	$codes = array(
		'antarctica' => array( 'AQ', 'BV', 'GS', 'HM', 'TF' ),

		'africa' => array(
			'AO', 'BF', 'BI', 'BJ', 'BW', 'CD', 'CF', 'CG', 'CI', 'CM', 'CV', 'DJ', 'DZ', 'EG', 'EH', 'ER', 'ET',
			'GA', 'GH', 'GM', 'GN', 'GQ', 'GW', 'KE', 'KM', 'LR', 'LS', 'LY', 'MA', 'MG', 'ML', 'MR', 'MU', 'MW',
			'MZ', 'NA', 'NE', 'NG', 'RE', 'RW', 'SC', 'SD', 'SH', 'SL', 'SN', 'SO', 'ST', 'SZ', 'TD', 'TG', 'TN',
			'TZ', 'UG', 'YT', 'ZA', 'ZM', 'ZW',

		'asia' => array(
			// Includes the Middle East, Armenia, Azerbaijan, Cyprus, Georgia.
			'AE', 'AF', 'AM', 'AP', 'AZ', 'BD', 'BH', 'BN', 'BT', 'CC', 'CN', 'CX', 'CY', 'GE', 'HK', 'ID', 'IL',
			'IN', 'IO', 'IQ', 'IR', 'JO', 'JP', 'KG', 'KH', 'KP', 'KR', 'KW', 'KZ', 'LA', 'LB', 'LK', 'MM', 'MN',
			'MO', 'MV', 'MY', 'NP', 'OM', 'PH', 'PK', 'PS', 'QA', 'SA', 'SG', 'SY', 'TH', 'TJ', 'TL', 'TM', 'TW',
			'UZ', 'VN', 'YE',

		'europe' => array(
			// Includes Russia, Turkey.
			'AD', 'AL', 'AT', 'AX', 'BA', 'BE', 'BG', 'BY', 'CH', 'CZ', 'DE', 'DK', 'EE', 'ES', 'EU', 'FI', 'FO',
			'FR', 'FX', 'GB', 'GG', 'GI', 'GR', 'HR', 'HU', 'IE', 'IM', 'IS', 'IT', 'JE', 'LI', 'LT', 'LU', 'LV',
			'MC', 'MD', 'ME', 'MK', 'MT', 'NL', 'NO', 'PL', 'PT', 'RO', 'RS', 'RU', 'SE', 'SI', 'SJ', 'SK', 'SM',
			'TR', 'UA', 'VA',

		'north america' => array(
			'AG', 'AI', 'AN', 'AW', 'BB', 'BL', 'BM', 'BS', 'BZ', 'CA', 'CR', 'CU', 'DM', 'DO', 'GD', 'GL', 'GP',
			'GT', 'HN', 'HT', 'JM', 'KN', 'KY', 'LC', 'MF', 'MQ', 'MS', 'MX', 'NI', 'PA', 'PM', 'PR', 'SV', 'TC',
			'TT', 'US', 'VC', 'VG', 'VI',

		'oceania' => array(
			'AS', 'AU', 'CK', 'FJ', 'FM', 'GU', 'KI', 'MH', 'MP', 'NC', 'NF', 'NR', 'NU', 'NZ', 'PF', 'PG', 'PN',
			'PW', 'SB', 'TK', 'TO', 'TV', 'UM', 'VU', 'WF', 'WS',

		'south america' => array(
			'AR', 'BO', 'BR', 'CL', 'CO', 'EC', 'FK', 'GF', 'GY', 'PE', 'PY', 'SR', 'UY', 'VE',

	if ( $continent ) {
		return $codes[ $continent ];
	} else {
		return $codes;

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