フォームから都道府県コード受け取った後に都道府県名への変換PHP Switch Case文ひな形

switch ($select_prefecture){


case '1':
$select_prefecture = '北海道';
break;

case '2':
$select_prefecture = '青森県';
break;

case '3':
$select_prefecture = '岩手県';
break;

case '4':
$select_prefecture = '宮城県';
break;

case '5':
$select_prefecture = '秋田県';
break;

case '6':
$select_prefecture = '山形県';
break;

case '7':
$select_prefecture = '福島県';
break;

case '8':
$select_prefecture = '茨城県';
break;

case '9':
$select_prefecture = '栃木県';
break;

case '10':
$select_prefecture = '群馬県';
break;

case '11':
$select_prefecture = '埼玉県';
break;

case '12':
$select_prefecture = '千葉県';
break;

case '13':
$select_prefecture = '東京都';
break;

case '14':
$select_prefecture = '神奈川県';
break;

case '15':
$select_prefecture = '新潟県';
break;

case '16':
$select_prefecture = '富山県';
break;

case '17':
$select_prefecture = '石川県';
break;

case '18':
$select_prefecture = '福井県';
break;

case '19':
$select_prefecture = '山梨県';
break;

case '20':
$select_prefecture = '長野県';
break;

case '21':
$select_prefecture = '岐阜県';
break;

case '22':
$select_prefecture = '静岡県';
break;

case '23':
$select_prefecture = '愛知県';
break;

case '24':
$select_prefecture = '三重県';
break;

case '25':
$select_prefecture = '滋賀県';
break;

case '26':
$select_prefecture = '京都府';
break;

case '27':
$select_prefecture = '大阪府';
break;

case '28':
$select_prefecture = '兵庫県';
break;

case '29':
$select_prefecture = '奈良県';
break;

case '30':
$select_prefecture = '和歌山県';
break;

case '31':
$select_prefecture = '鳥取県';
break;

case '32':
$select_prefecture = '島根県';
break;

case '33':
$select_prefecture = '岡山県';
break;

case '34':
$select_prefecture = '広島県';
break;

case '35':
$select_prefecture = '山口県';
break;

case '36':
$select_prefecture = '徳島県';
break;

case '37':
$select_prefecture = '香川県';
break;

case '38':
$select_prefecture = '愛媛県';
break;

case '39':
$select_prefecture = '高知県';
break;

case '40':
$select_prefecture = '福岡県';
break;

case '41':
$select_prefecture = '佐賀県';
break;

case '42':
$select_prefecture = '長崎県';
break;

case '43':
$select_prefecture = '熊本県';
break;

case '44':
$select_prefecture = '大分県';
break;

case '45':
$select_prefecture = '宮崎県';
break;

case '46':
$select_prefecture = '鹿児島県';
break;

case '47':
$select_prefecture = '沖縄県';
break;

}