$countries = array(
	"AF" => array("country" => "Afghanistan", "continent" => "Asia"),
	"AX" => array("country" => "Ã…land Islands", "continent" => "Europe"),
	"AL" => array("country" => "Albania", "continent" => "Europe"),
	"DZ" => array("country" => "Algeria", "continent" => "Africa"),
	"AS" => array("country" => "American Samoa", "continent" => "Oceania"),
	"AD" => array("country" => "Andorra", "continent" => "Europe"),
	"AO" => array("country" => "Angola", "continent" => "Africa"),
	"AI" => array("country" => "Anguilla", "continent" => "North America"),
	"AQ" => array("country" => "Antarctica", "continent" => "Antarctica"),
	"AG" => array("country" => "Antigua and Barbuda", "continent" => "North America"),
	"AR" => array("country" => "Argentina", "continent" => "South America"),
	"AM" => array("country" => "Armenia", "continent" => "Asia"),
	"AW" => array("country" => "Aruba", "continent" => "North America"),
	"AU" => array("country" => "Australia", "continent" => "Oceania"),
	"AT" => array("country" => "Austria", "continent" => "Europe"),
	"AZ" => array("country" => "Azerbaijan", "continent" => "Asia"),
	"BS" => array("country" => "Bahamas", "continent" => "North America"),
	"BH" => array("country" => "Bahrain", "continent" => "Asia"),
	"BD" => array("country" => "Bangladesh", "continent" => "Asia"),
	"BB" => array("country" => "Barbados", "continent" => "North America"),
	"BY" => array("country" => "Belarus", "continent" => "Europe"),
	"BE" => array("country" => "Belgium", "continent" => "Europe"),
	"BZ" => array("country" => "Belize", "continent" => "North America"),
	"BJ" => array("country" => "Benin", "continent" => "Africa"),
	"BM" => array("country" => "Bermuda", "continent" => "North America"),
	"BT" => array("country" => "Bhutan", "continent" => "Asia"),
	"BO" => array("country" => "Bolivia", "continent" => "South America"),
	"BA" => array("country" => "Bosnia and Herzegovina", "continent" => "Europe"),
	"BW" => array("country" => "Botswana", "continent" => "Africa"),
	"BV" => array("country" => "Bouvet Island", "continent" => "Antarctica"),
	"BR" => array("country" => "Brazil", "continent" => "South America"),
	"IO" => array("country" => "British Indian Ocean Territory", "continent" => "Asia"),
	"BN" => array("country" => "Brunei Darussalam", "continent" => "Asia"),
	"BG" => array("country" => "Bulgaria", "continent" => "Europe"),
	"BF" => array("country" => "Burkina Faso", "continent" => "Africa"),
	"BI" => array("country" => "Burundi", "continent" => "Africa"),
	"KH" => array("country" => "Cambodia", "continent" => "Asia"),
	"CM" => array("country" => "Cameroon", "continent" => "Africa"),
	"CA" => array("country" => "Canada", "continent" => "North America"),
	"CV" => array("country" => "Cape Verde", "continent" => "Africa"),
	"KY" => array("country" => "Cayman Islands", "continent" => "North America"),
	"CF" => array("country" => "Central African Republic", "continent" => "Africa"),
	"TD" => array("country" => "Chad", "continent" => "Africa"),
	"CL" => array("country" => "Chile", "continent" => "South America"),
	"CN" => array("country" => "China", "continent" => "Asia"),
	"CX" => array("country" => "Christmas Island", "continent" => "Asia"),
	"CC" => array("country" => "Cocos (Keeling) Islands", "continent" => "Asia"),
	"CO" => array("country" => "Colombia", "continent" => "South America"),
	"KM" => array("country" => "Comoros", "continent" => "Africa"),
	"CG" => array("country" => "Congo", "continent" => "Africa"),
	"CD" => array("country" => "The Democratic Republic of The Congo", "continent" => "Africa"),
	"CK" => array("country" => "Cook Islands", "continent" => "Oceania"),
	"CR" => array("country" => "Costa Rica", "continent" => "North America"),
	"CI" => array("country" => "Cote D'ivoire", "continent" => "Africa"),
	"HR" => array("country" => "Croatia", "continent" => "Europe"),
	"CU" => array("country" => "Cuba", "continent" => "North America"),
	"CY" => array("country" => "Cyprus", "continent" => "Asia"),
	"CZ" => array("country" => "Czech Republic", "continent" => "Europe"),
	"DK" => array("country" => "Denmark", "continent" => "Europe"),
	"DJ" => array("country" => "Djibouti", "continent" => "Africa"),
	"DM" => array("country" => "Dominica", "continent" => "North America"),
	"DO" => array("country" => "Dominican Republic", "continent" => "North America"),
	"EC" => array("country" => "Ecuador", "continent" => "South America"),
	"EG" => array("country" => "Egypt", "continent" => "Africa"),
	"SV" => array("country" => "El Salvador", "continent" => "North America"),
	"GQ" => array("country" => "Equatorial Guinea", "continent" => "Africa"),
	"ER" => array("country" => "Eritrea", "continent" => "Africa"),
	"EE" => array("country" => "Estonia", "continent" => "Europe"),
	"ET" => array("country" => "Ethiopia", "continent" => "Africa"),
	"FK" => array("country" => "Falkland Islands (Malvinas)", "continent" => "South America"),
	"FO" => array("country" => "Faroe Islands", "continent" => "Europe"),
	"FJ" => array("country" => "Fiji", "continent" => "Oceania"),
	"FI" => array("country" => "Finland", "continent" => "Europe"),
	"FR" => array("country" => "France", "continent" => "Europe"),
	"GF" => array("country" => "French Guiana", "continent" => "South America"),
	"PF" => array("country" => "French Polynesia", "continent" => "Oceania"),
	"TF" => array("country" => "French Southern Territories", "continent" => "Antarctica"),
	"GA" => array("country" => "Gabon", "continent" => "Africa"),
	"GM" => array("country" => "Gambia", "continent" => "Africa"),
	"GE" => array("country" => "Georgia", "continent" => "Asia"),
	"DE" => array("country" => "Germany", "continent" => "Europe"),
	"GH" => array("country" => "Ghana", "continent" => "Africa"),
	"GI" => array("country" => "Gibraltar", "continent" => "Europe"),
	"GR" => array("country" => "Greece", "continent" => "Europe"),
	"GL" => array("country" => "Greenland", "continent" => "North America"),
	"GD" => array("country" => "Grenada", "continent" => "North America"),
	"GP" => array("country" => "Guadeloupe", "continent" => "North America"),
	"GU" => array("country" => "Guam", "continent" => "Oceania"),
	"GT" => array("country" => "Guatemala", "continent" => "North America"),
	"GG" => array("country" => "Guernsey", "continent" => "Europe"),
	"GN" => array("country" => "Guinea", "continent" => "Africa"),
	"GW" => array("country" => "Guinea-bissau", "continent" => "Africa"),
	"GY" => array("country" => "Guyana", "continent" => "South America"),
	"HT" => array("country" => "Haiti", "continent" => "North America"),
	"HM" => array("country" => "Heard Island and Mcdonald Islands", "continent" => "Antarctica"),
	"VA" => array("country" => "Holy See (Vatican City State)", "continent" => "Europe"),
	"HN" => array("country" => "Honduras", "continent" => "North America"),
	"HK" => array("country" => "Hong Kong", "continent" => "Asia"),
	"HU" => array("country" => "Hungary", "continent" => "Europe"),
	"IS" => array("country" => "Iceland", "continent" => "Europe"),
	"IN" => array("country" => "India", "continent" => "Asia"),
	"ID" => array("country" => "Indonesia", "continent" => "Asia"),
	"IR" => array("country" => "Iran", "continent" => "Asia"),
	"IQ" => array("country" => "Iraq", "continent" => "Asia"),
	"IE" => array("country" => "Ireland", "continent" => "Europe"),
	"IM" => array("country" => "Isle of Man", "continent" => "Europe"),
	"IL" => array("country" => "Israel", "continent" => "Asia"),
	"IT" => array("country" => "Italy", "continent" => "Europe"),
	"JM" => array("country" => "Jamaica", "continent" => "North America"),
	"JP" => array("country" => "Japan", "continent" => "Asia"),
	"JE" => array("country" => "Jersey", "continent" => "Europe"),
	"JO" => array("country" => "Jordan", "continent" => "Asia"),
	"KZ" => array("country" => "Kazakhstan", "continent" => "Asia"),
	"KE" => array("country" => "Kenya", "continent" => "Africa"),
	"KI" => array("country" => "Kiribati", "continent" => "Oceania"),
	"KP" => array("country" => "Democratic People's Republic of Korea", "continent" => "Asia"),
	"KR" => array("country" => "Republic of Korea", "continent" => "Asia"),
	"KW" => array("country" => "Kuwait", "continent" => "Asia"),
	"KG" => array("country" => "Kyrgyzstan", "continent" => "Asia"),
	"LA" => array("country" => "Lao People's Democratic Republic", "continent" => "Asia"),
	"LV" => array("country" => "Latvia", "continent" => "Europe"),
	"LB" => array("country" => "Lebanon", "continent" => "Asia"),
	"LS" => array("country" => "Lesotho", "continent" => "Africa"),
	"LR" => array("country" => "Liberia", "continent" => "Africa"),
	"LY" => array("country" => "Libya", "continent" => "Africa"),
	"LI" => array("country" => "Liechtenstein", "continent" => "Europe"),
	"LT" => array("country" => "Lithuania", "continent" => "Europe"),
	"LU" => array("country" => "Luxembourg", "continent" => "Europe"),
	"MO" => array("country" => "Macao", "continent" => "Asia"),
	"MK" => array("country" => "Macedonia", "continent" => "Europe"),
	"MG" => array("country" => "Madagascar", "continent" => "Africa"),
	"MW" => array("country" => "Malawi", "continent" => "Africa"),
	"MY" => array("country" => "Malaysia", "continent" => "Asia"),
	"MV" => array("country" => "Maldives", "continent" => "Asia"),
	"ML" => array("country" => "Mali", "continent" => "Africa"),
	"MT" => array("country" => "Malta", "continent" => "Europe"),
	"MH" => array("country" => "Marshall Islands", "continent" => "Oceania"),
	"MQ" => array("country" => "Martinique", "continent" => "North America"),
	"MR" => array("country" => "Mauritania", "continent" => "Africa"),
	"MU" => array("country" => "Mauritius", "continent" => "Africa"),
	"YT" => array("country" => "Mayotte", "continent" => "Africa"),
	"MX" => array("country" => "Mexico", "continent" => "North America"),
	"FM" => array("country" => "Micronesia", "continent" => "Oceania"),
	"MD" => array("country" => "Moldova", "continent" => "Europe"),
	"MC" => array("country" => "Monaco", "continent" => "Europe"),
	"MN" => array("country" => "Mongolia", "continent" => "Asia"),
	"ME" => array("country" => "Montenegro", "continent" => "Europe"),
	"MS" => array("country" => "Montserrat", "continent" => "North America"),
	"MA" => array("country" => "Morocco", "continent" => "Africa"),
	"MZ" => array("country" => "Mozambique", "continent" => "Africa"),
	"MM" => array("country" => "Myanmar", "continent" => "Asia"),
	"NA" => array("country" => "Namibia", "continent" => "Africa"),
	"NR" => array("country" => "Nauru", "continent" => "Oceania"),
	"NP" => array("country" => "Nepal", "continent" => "Asia"),
	"NL" => array("country" => "Netherlands", "continent" => "Europe"),
	"AN" => array("country" => "Netherlands Antilles", "continent" => "North America"),
	"NC" => array("country" => "New Caledonia", "continent" => "Oceania"),
	"NZ" => array("country" => "New Zealand", "continent" => "Oceania"),
	"NI" => array("country" => "Nicaragua", "continent" => "North America"),
	"NE" => array("country" => "Niger", "continent" => "Africa"),
	"NG" => array("country" => "Nigeria", "continent" => "Africa"),
	"NU" => array("country" => "Niue", "continent" => "Oceania"),
	"NF" => array("country" => "Norfolk Island", "continent" => "Oceania"),
	"MP" => array("country" => "Northern Mariana Islands", "continent" => "Oceania"),
	"NO" => array("country" => "Norway", "continent" => "Europe"),
	"OM" => array("country" => "Oman", "continent" => "Asia"),
	"PK" => array("country" => "Pakistan", "continent" => "Asia"),
	"PW" => array("country" => "Palau", "continent" => "Oceania"),
	"PS" => array("country" => "Palestinia", "continent" => "Asia"),
	"PA" => array("country" => "Panama", "continent" => "North America"),
	"PG" => array("country" => "Papua New Guinea", "continent" => "Oceania"),
	"PY" => array("country" => "Paraguay", "continent" => "South America"),
	"PE" => array("country" => "Peru", "continent" => "South America"),
	"PH" => array("country" => "Philippines", "continent" => "Asia"),
	"PN" => array("country" => "Pitcairn", "continent" => "Oceania"),
	"PL" => array("country" => "Poland", "continent" => "Europe"),
	"PT" => array("country" => "Portugal", "continent" => "Europe"),
	"PR" => array("country" => "Puerto Rico", "continent" => "North America"),
	"QA" => array("country" => "Qatar", "continent" => "Asia"),
	"RE" => array("country" => "Reunion", "continent" => "Africa"),
	"RO" => array("country" => "Romania", "continent" => "Europe"),
	"RU" => array("country" => "Russian Federation", "continent" => "Europe"),
	"RW" => array("country" => "Rwanda", "continent" => "Africa"),
	"SH" => array("country" => "Saint Helena", "continent" => "Africa"),
	"KN" => array("country" => "Saint Kitts and Nevis", "continent" => "North America"),
	"LC" => array("country" => "Saint Lucia", "continent" => "North America"),
	"PM" => array("country" => "Saint Pierre and Miquelon", "continent" => "North America"),
	"VC" => array("country" => "Saint Vincent and The Grenadines", "continent" => "North America"),
	"WS" => array("country" => "Samoa", "continent" => "Oceania"),
	"SM" => array("country" => "San Marino", "continent" => "Europe"),
	"ST" => array("country" => "Sao Tome and Principe", "continent" => "Africa"),
	"SA" => array("country" => "Saudi Arabia", "continent" => "Asia"),
	"SN" => array("country" => "Senegal", "continent" => "Africa"),
	"RS" => array("country" => "Serbia", "continent" => "Europe"),
	"SC" => array("country" => "Seychelles", "continent" => "Africa"),
	"SL" => array("country" => "Sierra Leone", "continent" => "Africa"),
	"SG" => array("country" => "Singapore", "continent" => "Asia"),
	"SK" => array("country" => "Slovakia", "continent" => "Europe"),
	"SI" => array("country" => "Slovenia", "continent" => "Europe"),
	"SB" => array("country" => "Solomon Islands", "continent" => "Oceania"),
	"SO" => array("country" => "Somalia", "continent" => "Africa"),
	"ZA" => array("country" => "South Africa", "continent" => "Africa"),
	"GS" => array("country" => "South Georgia and The South Sandwich Islands", "continent" => "Antarctica"),
	"ES" => array("country" => "Spain", "continent" => "Europe"),
	"LK" => array("country" => "Sri Lanka", "continent" => "Asia"),
	"SD" => array("country" => "Sudan", "continent" => "Africa"),
	"SR" => array("country" => "Suriname", "continent" => "South America"),
	"SJ" => array("country" => "Svalbard and Jan Mayen", "continent" => "Europe"),
	"SZ" => array("country" => "Swaziland", "continent" => "Africa"),
	"SE" => array("country" => "Sweden", "continent" => "Europe"),
	"CH" => array("country" => "Switzerland", "continent" => "Europe"),
	"SY" => array("country" => "Syrian Arab Republic", "continent" => "Asia"),
	"TW" => array("country" => "Taiwan, Province of China", "continent" => "Asia"),
	"TJ" => array("country" => "Tajikistan", "continent" => "Asia"),
	"TZ" => array("country" => "Tanzania, United Republic of", "continent" => "Africa"),
	"TH" => array("country" => "Thailand", "continent" => "Asia"),
	"TL" => array("country" => "Timor-leste", "continent" => "Asia"),
	"TG" => array("country" => "Togo", "continent" => "Africa"),
	"TK" => array("country" => "Tokelau", "continent" => "Oceania"),
	"TO" => array("country" => "Tonga", "continent" => "Oceania"),
	"TT" => array("country" => "Trinidad and Tobago", "continent" => "North America"),
	"TN" => array("country" => "Tunisia", "continent" => "Africa"),
	"TR" => array("country" => "Turkey", "continent" => "Asia"),
	"TM" => array("country" => "Turkmenistan", "continent" => "Asia"),
	"TC" => array("country" => "Turks and Caicos Islands", "continent" => "North America"),
	"TV" => array("country" => "Tuvalu", "continent" => "Oceania"),
	"UG" => array("country" => "Uganda", "continent" => "Africa"),
	"UA" => array("country" => "Ukraine", "continent" => "Europe"),
	"AE" => array("country" => "United Arab Emirates", "continent" => "Asia"),
	"GB" => array("country" => "United Kingdom", "continent" => "Europe"),
	"US" => array("country" => "United States", "continent" => "North America"),
	"UM" => array("country" => "United States Minor Outlying Islands", "continent" => "Oceania"),
	"UY" => array("country" => "Uruguay", "continent" => "South America"),
	"UZ" => array("country" => "Uzbekistan", "continent" => "Asia"),
	"VU" => array("country" => "Vanuatu", "continent" => "Oceania"),
	"VE" => array("country" => "Venezuela", "continent" => "South America"),
	"VN" => array("country" => "Viet Nam", "continent" => "Asia"),
	"VG" => array("country" => "Virgin Islands, British", "continent" => "North America"),
	"VI" => array("country" => "Virgin Islands, U.S.", "continent" => "North America"),
	"WF" => array("country" => "Wallis and Futuna", "continent" => "Oceania"),
	"EH" => array("country" => "Western Sahara", "continent" => "Africa"),
	"YE" => array("country" => "Yemen", "continent" => "Asia"),
	"ZM" => array("country" => "Zambia", "continent" => "Africa"),
	"ZW" => array("country" => "Zimbabwe", "continent" => "Africa")
);


?>
		<select>
			<option>Choose country:</option>
			<?php
			foreach($countries as $country_code => $arr){
				echo '<option value="'.$country_code.'">'.$arr['country'].'</option>';
			}
			?>
		</select>

Here's a country list with continent and country by country code!

Country list with country code and continent

php, list, code

PHP