PHP массив континентов

<?php

// Вариант 1

$continents = [
    'AF' => 'Africa',
    'AN' => 'Antarctica',
    'AS' => 'Asia',
    'EU' => 'Europa',
    'NA' => 'North America',
    'OC' => 'Oceania',
    'SA' => 'South America',
];


// Вариант 2

$continents = [
    ['code' => 'AF', 'name' => 'Africa'],
    ['code' => 'AN', 'name' => 'Antarctica'],
    ['code' => 'AS', 'name' => 'Asia'],
    ['code' => 'EU', 'name' => 'Europa'],
    ['code' => 'NA', 'name' => 'North America'],
    ['code' => 'OC', 'name' => 'Oceania'],
    ['code' => 'SA', 'name' => 'South America'],
];
?

<?php
$continents = ['AF','AN','AS','EU','NA','OC','SA'];

<?php
$continents = ['Africa','Antarctica','Asia','Europa','North America','Oceania','South America'];