Country helper

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",
      "United States 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 static::$countries;
    }

    public static function reverse()
    {
        return array_flip(static::$countries);
    }

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

    public static function codes()
    {
        return array_values(static::$countries);
    }
}

Inspired by Jeffery Way's Utility