{"id":801,"date":"2007-11-19T01:00:00","date_gmt":"2007-11-18T16:00:00","guid":{"rendered":"https:\/\/ecoop.net\/memo\/2007-11-19-1.html"},"modified":"2007-11-19T01:00:00","modified_gmt":"2007-11-18T16:00:00","slug":"2007-11-19-1","status":"publish","type":"post","link":"https:\/\/www.ecoop.net\/memo\/archives\/2007-11-19-1.html","title":{"rendered":"\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3 – switch \u306e\u30c7\u30fc\u30bf\u578b\u306f\u8907\u6570\u7a2e\u985e\u306b\u3059\u308b\u3068\u4e88\u671f\u3057\u306a\u3044\u7d50\u679c\u306b\u306a\u308b"},"content":{"rendered":"

\n\u307e\u305a\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u3001\u7d50\u679c\u3092\u4e88\u60f3\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\n<\/p>\n

<?php
\n$result = true;
\nswitch($result){
\n  case “error”: \/\/ \u30a8\u30e9\u30fc
\n    echo “failure”;
\n    exit;
\n  case “ok”: \/\/ \u6210\u529f
\n  case true: \/\/
\n    echo “success”;
\n    exit;
\n  default:
\n    echo “unexpected”;
\n    exit;
\n}
\n?>\n<\/p><\/blockquote>\n

\u4e00\u898b\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068 success \u304c\u51fa\u529b\u3055\u308c\u308b\u3088\u3046\u306b\u601d\u3044\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u610f\u5916\u306a\u3053\u3068\u306b failure \u304c\u51fa\u529b\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002
\nPHP \u306e switch \u6587\u306f\u3001switch \u306e\u5f15\u6570\u3068 case \u3067\u6307\u5b9a\u3057\u305f\u5024\u3068\u3092= \u3067\u306f\u306a\u304f) <\/s> \u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u305f\u3081\u3001switch \u5f15\u6570\u304c\u8907\u6570\u306e\u7a2e\u985e\u306e\u578b\u306b\u306a\u308b\u5834\u5408\u306f\u578b\u5909\u63db\u306a\u3069\u306b\u3088\u308a\u4e88\u60f3\u5916\u306e\u5024\u3068\u4e00\u81f4\u3059\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u304c\u539f\u56e0\u3067\u3059\u3002
\n 
\n\u5b9f\u969b\u3069\u306e\u5024\u304c\u4f55\u3068\u4e00\u81f4\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u5206\u304b\u308a\u307e\u3059\u3002\n<\/p>\n

\/\/ \u691c\u8a3c\u30b3\u30fc\u30c9:
\n<?php
\n\/\/ values to test
\n$targets = array(
\n   0,
\n   1,
\n   true,
\n   false,
\n   null,
\n   “”,
\n   “0.00e5”,
\n   “10f”,
\n   “0f”,
\n   array(),
\n   array(1),
\n   array(“key”=>”foo”),
\n);
\n 
\n\/\/ —-
\nforeach($targets as $target){
\n  if(is_bool($target))
\n      $s = $target? “true”: “false”;
\n  elseif(is_null($target))
\n      $s = “null”;
\n  elseif(is_string($target))
\n      $s = “‘{$target}'”;
\n  else
\n      $s = $target;
\n  echo $s .”(“.gettype($target).”)”.”:\\t”;
\n  switch($target){ \/\/”0.00e5″
\n    case ‘a’: echo “case a”; break;
\n    case ‘b’: echo “case b”; break;
\n    case ‘0’: echo “case zero”; break;
\n    case 10: echo “case int 10”; break;
\n    case 0: echo “case int 0”; break;
\n    default: echo “default”; break;
\n  }
\n  echo “\\n”;
\n}\n<\/p><\/blockquote>\n

php 4.4.6 \u304a\u3088\u3073 php 5.2.3 \u3067\u8a66\u3057\u305f\u3068\u3053\u308d\u3001\u5b9f\u884c\u7d50\u679c\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\n<\/p>\n

0(integer): case a
\n1(integer): default
\ntrue(boolean): case a
\nfalse(boolean): case zero
\nnull(NULL): case int 0
\n”(string): case int 0
\n‘0.00e5′(string): case zero
\n’10f'(string): case int 10
\n‘0f'(string): case int 0
\nArray(array): default
\nArray(array): default
\nArray(array): default\n<\/p><\/blockquote>\n

\u540c\u3058 empty \u5024\u3067\u3082 0, null, false, “” \u3067\u7d50\u679c\u304c\u5168\u304f\u7570\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002
\n\u307e\u305f\u3001 == \u306b\u3064\u3044\u3066\u6319\u3052\u3089\u308c\u308b\u6570\u5024\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u6642\u306e\u554f\u984c(“0.00e5” == “0” \u304c\u771f\u306b\u306a\u308b,\u306a\u3069)\u306e\u5f71\u97ff\u3082\u53d7\u3051\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002
\n 
\n\u3053\u306e\u554f\u984c\u306f\u3001\u578b\u30c1\u30a7\u30c3\u30af\u3092\u53b3\u5bc6\u306b\u3057\u305f\u308a\u3001strval(), intval() \u306a\u3069\u3067\u660e\u793a\u7684\u306b\u6587\u5b57\u5217,\u6570\u5024\u30ad\u30e3\u30b9\u30c8\u3092\u884c\u3044\u3001switch \u6587\u306e\u5f15\u6570\u306e\u578b\u304c\u4e00\u7a2e\u985e\u306b\u306a\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3053\u3068\u3067\u3042\u308b\u7a0b\u5ea6\u56de\u907f\u3067\u304d\u307e\u3059\u3002
\n\u3057\u304b\u3057\u4f9d\u7136\u3068\u3057\u3066\u6570\u5024\u3068\u3057\u3066\u6709\u52b9\u306a\u6587\u5b57\u5217\u540c\u58eb\u306e\u6bd4\u8f03\u306e\u554f\u984c\u304c\u3042\u308b\u305f\u3081\u3001\u6570\u5024\u3092\u542b\u3080\u6587\u5b57\u5217\u306b\u3064\u3044\u3066\u6b63\u78ba\u3055\u304c\u5fc5\u8981\u306a\u5834\u5408\u3084\u3001\u672c\u5f53\u306b\u8907\u6570\u578b\u3092\u5224\u5225\u3055\u305b\u305f\u3044\u5834\u5408\u306f= \u6f14\u7b97\u5b50\u3092\u4f7f\u3044 if – elseif – else \u3092\u4f7f\u3046\u307b\u3046\u304c\u8ce2\u660e\u3067\u3057\u3087\u3046\u3002\n<\/p>\n

if($result <\/s>= true || $result= “ok”){
\n  echo “success”;
\n}elseif(empty($result) || $result <\/s>= “error”){
\n  \/\/ empty($result) \u306f\u4ee5\u4e0b\u306e\u5f0f\u3068\u7b49\u4fa1\u3002
\n  \/\/ ( !isset($result) || ($result= false || $result <\/s>= null ||
\n  \/\/ $result= “” || $result <\/s>= 0 )
\n  echo “failure”;
\n}else{
\n  echo “unexpected”;
\n}\n<\/p><\/blockquote>\n

 
\n\u53c2\u8003:
\n– switch \u69cb\u6587<\/a>(php.net)
\n– \u6bd4\u8f03\u6f14\u7b97\u5b50<\/a>(php.net)
\n– strval()<\/a>(php.net)<\/p>\n","protected":false},"excerpt":{"rendered":"

\u307e\u305a\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u3001\u7d50\u679c\u3092\u4e88\u60f3\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002 <?php $result = true; switch($result){   case “error”: \/ … \u7d9a\u304d\u3092\u8aad\u3080 \u30d0\u30b0\u30d1\u30bf\u30fc\u30f3 – switch \u306e\u30c7\u30fc\u30bf\u578b\u306f\u8907\u6570\u7a2e\u985e\u306b\u3059\u308b\u3068\u4e88\u671f\u3057\u306a\u3044\u7d50\u679c\u306b\u306a\u308b<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[32],"class_list":["post-801","post","type-post","status-publish","format-standard","hentry","tag-php"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/801","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/comments?post=801"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/801\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/media?parent=801"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/categories?post=801"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/tags?post=801"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}