PHP Countries Utitility Class

Country.php

<?php
namespace App\Http\Utilities;

class Country {

    protected static $countries = [
        "United States"                                => "us",
        "Afghanistan"                                  => "af",
        "Albania"                                      => "al",
        "Algeria"                                      => "dz",
        "American Samoa"                               => "as",
        "Andorra"                                      => "ad",
        "Angola"                                       => "ad",
        "Anguilla"                                     => "ai",
        "Antarctica"                                   => "aq",
        "Antigua and Barbuda"                          => "ag",
        "Argentina"                                    => "ar",
        "Armenia"                                      => "am",
        "Aruba"                                        => "aw",
        "Australia"                                    => "au",
        "Austria"                                      => "at",
        "Azerbaijan"                                   => "az",
        "Bahamas"                                      => "bs",
        "Bahrain"                                      => "bh",
        "Bangladesh"                                   => "bd",
        "Barbados"                                     => "bb",
        "Belarus"                                      => "by",
        "Belgium"                                      => "be",
        "Belize"                                       => "bz",
        "Benin"                                        => "bj",
        "Bermuda"                                      => "bm",
        "Bhutan"                                       => "bt",
        "Bolivia"                                      => "bo",
        "Bosnia and Herzegowina"                       => "ba",
        "Botswana"                                     => "bw",
        "Bouvet Island"                                => "bv",
        "Brazil"                                       => "br",
        "British Indian Ocean Territory"               => "io",
        "Brunei Darussalam"                            => "bn",
        "Bulgaria"                                     => "bg",
        "Burkina Faso"                                 => "bf",
        "Burundi"                                      => "bi",
        "Cambodia"                                     => "kh",
        "Cameroon"                                     => "cm",
        "Canada"                                       => "ca",
        "Cabo Verde"                                   => "cv",
        "Cayman Islands"                               => "ky",
        "Central African Republic"                     => "cf",
        "Chad"                                         => "td",
        "Chile"                                        => "cl",
        "China"                                        => "cn",
        "Christmas Island"                             => "cx",
        "Cocos (Keeling) Islands"                      => "cc",
        "Colombia"                                     => "co",
        "Comoros"                                      => "km",
        "Congo"                                        => "cg",
        "Congo, the Democratic Republic of the"        => "cd",
        "Cook Islands"                                 => "ck",
        "Costa Rica"                                   => "cr",
        "Cote d'Ivoire"                                => "ci",
        "Croatia (Hrvatska)"                           => "hr",
        "Cuba"                                         => "cu",
        "Cyprus"                                       => "cy",
        "Czech Republic"                               => "cz",
        "Denmark"                                      => "dk",
        "Djibouti"                                     => "dj",
        "Dominica"                                     => "dm",
        "Dominican Republic"                           => "do",
        "East Timor"                                   => "tl",
        "Ecuador"                                      => "ec",
        "Egypt"                                        => "eg",
        "El Salvador"                                  => "sv",
        "Equatorial Guinea"                            => "gq",
        "Eritrea"                                      => "er",
        "Estonia"                                      => "ee",
        "Ethiopia"                                     => "et",
        "Falkland Islands (Malvinas)"                  => "fk",
        "Faroe Islands"                                => "fo",
        "Fiji"                                         => "fj",
        "Finland"                                      => "fi",
        "France"                                       => "fr",
        "French Guiana"                                => "gf",
        "French Polynesia"                             => "pf",
        "French Southern Territories"                  => "tf",
        "Gabon"                                        => "ga",
        "Gambia"                                       => "gm",
        "Georgia"                                      => "ge",
        "Germany"                                      => "de",
        "Ghana"                                        => "gh",
        "Gibraltar"                                    => "gi",
        "Greece"                                       => "gr",
        "Greenland"                                    => "gl",
        "Grenada"                                      => "gd",
        "Guadeloupe"                                   => "gp",
        "Guam"                                         => "gu",
        "Guatemala"                                    => "gt",
        "Guinea"                                       => "gn",
        "Guinea-Bissau"                                => "gw",
        "Guyana"                                       => "gy",
        "Haiti"                                        => "ht",
        "Heard and Mc Donald Islands"                  => "hm",
        "Holy See (Vatican City State)"                => "va",
        "Honduras"                                     => "hn",
        "Hong Kong"                                    => "hk",
        "Hungary"                                      => "hu",
        "Iceland"                                      => "is",
        "India"                                        => "in",
        "Indonesia"                                    => "id",
        "Iran (Islamic Republic of)"                   => "ir",
        "Iraq"                                         => "iq",
        "Ireland"                                      => "ie",
        "Israel"                                       => "il",
        "Italy"                                        => "it",
        "Jamaica"                                      => "jm",
        "Japan"                                        => "jp",
        "Jordan"                                       => "jo",
        "Kazakhstan"                                   => "kz",
        "Kenya"                                        => "ke",
        "Kiribati"                                     => "ki",
        "Korea, Democratic People's Republic of"       => "kp",
        "Korea, Republic of"                           => "kr",
        "Kuwait"                                       => "kw",
        "Kyrgyzstan"                                   => "kg",
        "Lao, People's Democratic Republic"            => "la",
        "Latvia"                                       => "lv",
        "Lebanon"                                      => "lb",
        "Lesotho"                                      => "ls",
        "Liberia"                                      => "lr",
        "Libyan Arab Jamahiriya"                       => "ly",
        "Liechtenstein"                                => "li",
        "Lithuania"                                    => "lt",
        "Luxembourg"                                   => "lu",
        "Macao"                                        => "mo",
        "Macedonia, The Former Yugoslav Republic of"   => "mk",
        "Madagascar"                                   => "mg",
        "Malawi"                                       => "mw",
        "Malaysia"                                     => "my",
        "Maldives"                                     => "mv",
        "Mali"                                         => "ml",
        "Malta"                                        => "mt",
        "Marshall Islands"                             => "mh",
        "Martinique"                                   => "mq",
        "Mauritania"                                   => "mr",
        "Mauritius"                                    => "mu",
        "Mayotte"                                      => "yt",
        "Mexico"                                       => "mx",
        "Micronesia, Federated States of"              => "fm",
        "Moldova, Republic of"                         => "md",
        "Monaco"                                       => "mc",
        "Mongolia"                                     => "mn",
        "Montserrat"                                   => "ms",
        "Morocco"                                      => "ma",
        "Mozambique"                                   => "mz",
        "Myanmar"                                      => "mm",
        "Namibia"                                      => "na",
        "Nauru"                                        => "nr",
        "Nepal"                                        => "np",
        "Netherlands"                                  => "nl",
        "Netherlands Antilles"                         => "an",
        "New Caledonia"                                => "nc",
        "New Zealand"                                  => "nz",
        "Nicaragua"                                    => "ni",
        "Niger"                                        => "ne",
        "Nigeria"                                      => "ng",
        "Niue"                                         => "nu",
        "Norfolk Island"                               => "nf",
        "Northern Mariana Islands"                     => "mp",
        "Norway"                                       => "no",
        "Oman"                                         => "om",
        "Pakistan"                                     => "pk",
        "Palau"                                        => "pw",
        "Panama"                                       => "pa",
        "Papua New Guinea"                             => "pg",
        "Paraguay"                                     => "py",
        "Peru"                                         => "pe",
        "Philippines"                                  => "ph",
        "Pitcairn"                                     => "pn",
        "Poland"                                       => "pl",
        "Portugal"                                     => "pt",
        "Puerto Rico"                                  => "pr",
        "Qatar"                                        => "qa",
        "Reunion"                                      => "re",
        "Romania"                                      => "ro",
        "Russian Federation"                           => "ru",
        "Rwanda"                                       => "rw",
        "Saint Kitts and Nevis"                        => "kn",
        "Saint Lucia"                                  => "lc",
        "Saint Vincent and the Grenadines"             => "vc",
        "Samoa"                                        => "ws",
        "San Marino"                                   => "sm",
        "Sao Tome and Principe"                        => "st",
        "Saudi Arabia"                                 => "sa",
        "Senegal"                                      => "sn",
        "Seychelles"                                   => "sc",
        "Sierra Leone"                                 => "sl",
        "Singapore"                                    => "sg",
        "Slovakia (Slovak Republic)"                   => "sk",
        "Slovenia"                                     => "si",
        "Solomon Islands"                              => "sb",
        "Somalia"                                      => "so",
        "South Africa"                                 => "za",
        "South Georgia and the South Sandwich Islands" => "gs",
        "Spain"                                        => "es",
        "Sri Lanka"                                    => "lk",
        "St. Helena"                                   => "sh",
        "St. Pierre and Miquelon"                      => "pm",
        "Sudan"                                        => "sd",
        "Suriname"                                     => "sr",
        "Svalbard and Jan Mayen Islands"               => "sj",
        "Swaziland"                                    => "sz",
        "Sweden"                                       => "se",
        "Switzerland"                                  => "ch",
        "Syrian Arab Republic"                         => "sy",
        "Taiwan, Province of China"                    => "tw",
        "Tajikistan"                                   => "tj",
        "Tanzania, United Republic of"                 => "tz",
        "Thailand"                                     => "th",
        "Togo"                                         => "tg",
        "Tokelau"                                      => "tk",
        "Tonga"                                        => "to",
        "Trinidad and Tobago"                          => "tt",
        "Tunisia"                                      => "tn",
        "Turkey"                                       => "tr",
        "Turkmenistan"                                 => "tm",
        "Turks and Caicos Islands"                     => "tc",
        "Tuvalu"                                       => "tv",
        "Uganda"                                       => "ug",
        "Ukraine"                                      => "ua",
        "United Arab Emirates"                         => "ae",
        "United Kingdom"                               => "gb",
        "United States"                                => "us",
        "U.S. Minor Outlying Islands"                  => "um",
        "Uruguay"                                      => "uy",
        "Uzbekistan"                                   => "uz",
        "Vanuatu"                                      => "vu",
        "Venezuela"                                    => "ve",
        "Vietnam"                                      => "vn",
        "Virgin Islands (British)"                     => "vg",
        "Virgin Islands (U.S.)"                        => "vi",
        "Wallis and Futuna Islands"                    => "wf",
        "Western Sahara"                               => "eh",
        "Yemen"                                        => "ye",
        "Serbia"                                       => "yu",
        "Zambia"                                       => "zm",
        "Zimbabwe"                                     => "zw"
    ];

   public static function all()
   {
        return array_keys(static::$countries);
   }
}