ISO 3166-1 alpha-3 countries list as a PHP array sorted by country name, not country code. I've added Scotland (SCO) and England (ENG), because for the purpose I needed it I couldn't go with just Great Britain (GB).

iso_array.php

<?php
$iso_array = array (
  'AFG' => 'Afghanistan',
  'ALB' => 'Albania',
  'DZA' => 'Algeria',
  'ASM' => 'American Samoa',
  'AND' => 'Andorra',
  'AGO' => 'Angola',
  'AIA' => 'Anguilla',
  'ATA' => 'Antarctica',
  'ATG' => 'Antigua and Barbuda',
  'ARG' => 'Argentina',
  'ARM' => 'Armenia',
  'ABW' => 'Aruba',
  'AUS' => 'Australia',
  'AUT' => 'Austria',
  'AZE' => 'Azerbaijan',
  'BHS' => 'Bahamas',
  'BHR' => 'Bahrain',
  'BGD' => 'Bangladesh',
  'BRB' => 'Barbados',
  'BLR' => 'Belarus',
  'BEL' => 'Belgium',
  'BLZ' => 'Belize',
  'BEN' => 'Benin',
  'BMU' => 'Bermuda',
  'BTN' => 'Bhutan',
  'BOL' => 'Bolivia, Plurinational State of',
  'BES' => 'Bonaire, Sint Eustatius and Saba',
  'BIH' => 'Bosnia and Herzegovina',
  'BWA' => 'Botswana',
  'BVT' => 'Bouvet Island',
  'BRA' => 'Brazil',
  'IOT' => 'British Indian Ocean Territory',
  'BRN' => 'Brunei Darussalam',
  'BGR' => 'Bulgaria',
  'BFA' => 'Burkina Faso',
  'BDI' => 'Burundi',
  'KHM' => 'Cambodia',
  'CMR' => 'Cameroon',
  'CAN' => 'Canada',
  'CPV' => 'Cape Verde',
  'CYM' => 'Cayman Islands',
  'CAF' => 'Central African Republic',
  'TCD' => 'Chad',
  'CHL' => 'Chile',
  'CHN' => 'China',
  'CXR' => 'Christmas Island',
  'CCK' => 'Cocos (Keeling) Islands',
  'COL' => 'Colombia',
  'COM' => 'Comoros',
  'COG' => 'Congo',
  'COD' => 'Congo, the Democratic Republic of the',
  'COK' => 'Cook Islands',
  'CRI' => 'Costa Rica',
  'HRV' => 'Croatia',
  'CUB' => 'Cuba',
  'CUW' => 'Curaçao',
  'CYP' => 'Cyprus',
  'CZE' => 'Czech Republic',
  'CIV' => 'Côte d\'Ivoire',
  'DNK' => 'Denmark',
  'DJI' => 'Djibouti',
  'DMA' => 'Dominica',
  'DOM' => 'Dominican Republic',
  'ECU' => 'Ecuador',
  'EGY' => 'Egypt',
  'SLV' => 'El Salvador',
  'ENG' => 'England',
  'GNQ' => 'Equatorial Guinea',
  'ERI' => 'Eritrea',
  'EST' => 'Estonia',
  'ETH' => 'Ethiopia',
  'FLK' => 'Falkland Islands (Malvinas)',
  'FRO' => 'Faroe Islands',
  'FJI' => 'Fiji',
  'FIN' => 'Finland',
  'FRA' => 'France',
  'GUF' => 'French Guiana',
  'PYF' => 'French Polynesia',
  'ATF' => 'French Southern Territories',
  'GAB' => 'Gabon',
  'GMB' => 'Gambia',
  'GEO' => 'Georgia',
  'DEU' => 'Germany',
  'GHA' => 'Ghana',
  'GIB' => 'Gibraltar',
  'GRC' => 'Greece',
  'GRL' => 'Greenland',
  'GRD' => 'Grenada',
  'GLP' => 'Guadeloupe',
  'GUM' => 'Guam',
  'GTM' => 'Guatemala',
  'GGY' => 'Guernsey',
  'GIN' => 'Guinea',
  'GNB' => 'Guinea-Bissau',
  'GUY' => 'Guyana',
  'HTI' => 'Haiti',
  'HMD' => 'Heard Island and McDonald Islands',
  'VAT' => 'Holy See (Vatican City State)',
  'HND' => 'Honduras',
  'HKG' => 'Hong Kong',
  'HUN' => 'Hungary',
  'ISL' => 'Iceland',
  'IND' => 'India',
  'IDN' => 'Indonesia',
  'IRN' => 'Iran, Islamic Republic of',
  'IRQ' => 'Iraq',
  'IRL' => 'Ireland',
  'IMN' => 'Isle of Man',
  'ISR' => 'Israel',
  'ITA' => 'Italy',
  'JAM' => 'Jamaica',
  'JPN' => 'Japan',
  'JEY' => 'Jersey',
  'JOR' => 'Jordan',
  'KAZ' => 'Kazakhstan',
  'KEN' => 'Kenya',
  'KIR' => 'Kiribati',
  'PRK' => 'Korea, Democratic People\'s Republic of',
  'KOR' => 'Korea, Republic of',
  'KWT' => 'Kuwait',
  'KGZ' => 'Kyrgyzstan',
  'LAO' => 'Lao People\'s Democratic Republic',
  'LVA' => 'Latvia',
  'LBN' => 'Lebanon',
  'LSO' => 'Lesotho',
  'LBR' => 'Liberia',
  'LBY' => 'Libya',
  'LIE' => 'Liechtenstein',
  'LTU' => 'Lithuania',
  'LUX' => 'Luxembourg',
  'MAC' => 'Macao',
  'MKD' => 'Macedonia (FYROM)',
  'MDG' => 'Madagascar',
  'MWI' => 'Malawi',
  'MYS' => 'Malaysia',
  'MDV' => 'Maldives',
  'MLI' => 'Mali',
  'MLT' => 'Malta',
  'MHL' => 'Marshall Islands',
  'MTQ' => 'Martinique',
  'MRT' => 'Mauritania',
  'MUS' => 'Mauritius',
  'MYT' => 'Mayotte',
  'MEX' => 'Mexico',
  'FSM' => 'Micronesia, Federated States of',
  'MDA' => 'Moldova, Republic of',
  'MCO' => 'Monaco',
  'MNG' => 'Mongolia',
  'MNE' => 'Montenegro',
  'MSR' => 'Montserrat',
  'MAR' => 'Morocco',
  'MOZ' => 'Mozambique',
  'MMR' => 'Myanmar',
  'NAM' => 'Namibia',
  'NRU' => 'Nauru',
  'NPL' => 'Nepal',
  'NLD' => 'Netherlands',
  'NCL' => 'New Caledonia',
  'NZL' => 'New Zealand',
  'NIC' => 'Nicaragua',
  'NER' => 'Niger',
  'NGA' => 'Nigeria',
  'NIU' => 'Niue',
  'NFK' => 'Norfolk Island',
  'MNP' => 'Northern Mariana Islands',
  'NOR' => 'Norway',
  'OMN' => 'Oman',
  'PAK' => 'Pakistan',
  'PLW' => 'Palau',
  'PSE' => 'Palestinian Territory, Occupied',
  'PAN' => 'Panama',
  'PNG' => 'Papua New Guinea',
  'PRY' => 'Paraguay',
  'PER' => 'Peru',
  'PHL' => 'Philippines',
  'PCN' => 'Pitcairn',
  'POL' => 'Poland',
  'PRT' => 'Portugal',
  'PRI' => 'Puerto Rico',
  'QAT' => 'Qatar',
  'ROU' => 'Romania',
  'RUS' => 'Russian Federation',
  'RWA' => 'Rwanda',
  'REU' => 'Réunion',
  'BLM' => 'Saint Barthélemy',
  'SHN' => 'Saint Helena, Ascension and Tristan da Cunha',
  'KNA' => 'Saint Kitts and Nevis',
  'LCA' => 'Saint Lucia',
  'MAF' => 'Saint Martin (French part)',
  'SPM' => 'Saint Pierre and Miquelon',
  'VCT' => 'Saint Vincent and the Grenadines',
  'WSM' => 'Samoa',
  'SMR' => 'San Marino',
  'STP' => 'Sao Tome and Principe',
  'SAU' => 'Saudi Arabia',
  'SCO' => 'Scotland',
  'SEN' => 'Senegal',
  'SRB' => 'Serbia',
  'SYC' => 'Seychelles',
  'SLE' => 'Sierra Leone',
  'SGP' => 'Singapore',
  'SXM' => 'Sint Maarten (Dutch part)',
  'SVK' => 'Slovakia',
  'SVN' => 'Slovenia',
  'SLB' => 'Solomon Islands',
  'SOM' => 'Somalia',
  'ZAF' => 'South Africa',
  'SGS' => 'South Georgia and the South Sandwich Islands',
  'SSD' => 'South Sudan',
  'ESP' => 'Spain',
  'LKA' => 'Sri Lanka',
  'SDN' => 'Sudan',
  'SUR' => 'Suriname',
  'SJM' => 'Svalbard and Jan Mayen',
  'SWZ' => 'Swaziland',
  'SWE' => 'Sweden',
  'CHE' => 'Switzerland',
  'SYR' => 'Syrian Arab Republic',
  'TWN' => 'Taiwan, Province of China',
  'TJK' => 'Tajikistan',
  'TZA' => 'Tanzania, United Republic of',
  'THA' => 'Thailand',
  'TLS' => 'Timor-Leste',
  'TGO' => 'Togo',
  'TKL' => 'Tokelau',
  'TON' => 'Tonga',
  'TTO' => 'Trinidad and Tobago',
  'TUN' => 'Tunisia',
  'TUR' => 'Turkey',
  'TKM' => 'Turkmenistan',
  'TCA' => 'Turks and Caicos Islands',
  'TUV' => 'Tuvalu',
  'UGA' => 'Uganda',
  'UKR' => 'Ukraine',
  'ARE' => 'United Arab Emirates',
  'GBR' => 'United Kingdom',
  'USA' => 'United States',
  'UMI' => 'United States Minor Outlying Islands',
  'URY' => 'Uruguay',
  'UZB' => 'Uzbekistan',
  'VUT' => 'Vanuatu',
  'VEN' => 'Venezuela, Bolivarian Republic of',
  'VNM' => 'Viet Nam',
  'VGB' => 'Virgin Islands, British',
  'VIR' => 'Virgin Islands, U.S.',
  'WLF' => 'Wallis and Futuna',
  'ESH' => 'Western Sahara',
  'YEM' => 'Yemen',
  'ZMB' => 'Zambia',
  'ZWE' => 'Zimbabwe',
  'ALA' => 'Åland Islands',
);