{"id":788,"date":"2007-10-22T01:00:00","date_gmt":"2007-10-21T16:00:00","guid":{"rendered":"https:\/\/ecoop.net\/memo\/2007-10-22-1.html"},"modified":"2026-08-10T14:42:22","modified_gmt":"2026-08-10T05:42:22","slug":"2007-10-22-1","status":"publish","type":"post","link":"https:\/\/www.ecoop.net\/memo\/archives\/2007-10-22-1.html","title":{"rendered":"PHP4 \u3068 PHP5 \u306e Sigleton Pattern"},"content":{"rendered":"

\nPHP4 \u3067\u306e Singleton<\/p>\n

error_reporting(E_ALL);
\nclass Foo {
\n    function &getInstance(){
\n        static $_singleton;
\n        if(empty($_singleton)){
\n            $_singleton = new Foo();
\n        }
\n        return $_singleton;
\n    }
\n    var $_n;
\n    function add(){
\n        echo (++$_n).”\\n”;
\n    }
\n}
\n$o1 =& Foo::getInstance();
\n$o1->add(); \/\/ 1
\n$o2 =& Foo::getInstance();
\n$o1->add(); \/\/ 2
\n$o2->add(); \/\/ 3
\n$o1->add(); \/\/ 4\n<\/p><\/blockquote>\n

 & \u3068 static \u306e\u4f7f\u3044\u65b9\u304c\u809d\u3067\u3059\u3002
\nstatic \u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u6307\u5b9a\u3057\u305f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u5ef6\u9577\u3059\u308b\u305f\u3081\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3059(\u6ce81)\u3002
\n \u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u3068\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306e\u4e21\u65b9\u306b & \u3092\u4ed8\u3051\u306a\u3044\u3068\u3001\u53c2\u7167\u3067\u306a\u304f\u30b3\u30d4\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u3001\u500b\u5225\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u306a\u308b\u305f\u3081\u306b\u7d50\u679c\u304c 1,2,1,3 \u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002
\n 
\nPHP5 \u306e\u5834\u5408\u3082\u4e0a\u306e\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u306a\u3057\u3067 Singleton Pattern \u3068\u3057\u3066\u52d5\u4f5c\u3055\u305b\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002
\n\u3055\u3089\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u304c\u6a19\u6e96\u3067\u53c2\u7167\u306b\u306a\u308b\u305f\u3081\u3001& \u3092\u5916\u3057\u3066\u3082 singleton \u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u304c\u8aa4\u7528\u3059\u308b\u53ef\u80fd\u6027\u304c\u306a\u304f\u306a\u3063\u305f\u3068\u3044\u3048\u307e\u3059(\u6ce82)\u3002
\n 
\n\u3053\u306e\u3088\u3046\u306b PHP4 \u3067\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u7279\u6b8a\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u65b9\u3092\u3057\u306a\u3044\u3068\u610f\u56f3\u3057\u306a\u3044\u7d50\u679c\u306b\u306a\u308b\u305f\u3081\u3001Singleton \u306a\u52d5\u4f5c\u304c\u5fc5\u8981\u306a\u7b87\u6240\u306b\u3064\u3044\u3066\u306f\u6975\u529b\u975e\u516c\u958b\u306b\u3057\u3066\u5185\u90e8\u5229\u7528\u306b\u3068\u3069\u3081\u308b\u307b\u3046\u304c\u8ce2\u660e\u304b\u3082\u3001\u3067\u3059\u3002
\n 
\n\u6ce81:
\nstatic \u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u306f\u3001\u30b9\u30b3\u30fc\u30d7(\u53ef\u7528\u7bc4\u56f2)\u3092\u5e83\u3052\u308b\u52b9\u679c\u306f\u3042\u308a\u307e\u305b\u3093\u3002
\n\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u304c\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u7570\u306a\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u540c\u3058\u540d\u524d\u306e\u5909\u6570\u3092\u6307\u5b9a\u3057\u3066\u3082\u3001\u5225\u500b\u306e\u5909\u6570\u306b\u306a\u308a\u307e\u3059\u3002
\n\u6ce82:
\n\u305f\u3060\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u3067\n<\/p>\n

$o1 = clone Foo::getInstance();\n<\/p><\/blockquote>\n

\u306e\u3088\u3046\u306b clone \u3092\u4f7f\u3063\u3066\u610f\u56f3\u7684\u306b\u30b3\u30d4\u30fc\u3092\u884c\u3063\u305f\u5834\u5408\u3001PHP4 \u3067 & \u3092\u4ed8\u3051\u306a\u304b\u3063\u305f\u3068\u304d\u3068\u540c\u69d8\u306e\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002
\n\u3053\u306e\u5834\u5408\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u7d50\u679c\u304c\u4e88\u6e2c\u3067\u304d\u308b\u305f\u3081\u3001\u554f\u984c\u306b\u306f\u306a\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u3002
\n 
\n\u53c2\u8003:
\n– PHP4 \u3067\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3(Do You PHP?)<\/p>\n","protected":false},"excerpt":{"rendered":"

PHP4 \u3067\u306e Singleton error_reporting(E_ALL); class Foo {     function &getInstance(){ &nb … \u7d9a\u304d\u3092\u8aad\u3080 PHP4 \u3068 PHP5 \u306e Sigleton Pattern<\/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":[141],"tags":[32],"class_list":["post-788","post","type-post","status-publish","format-standard","hentry","category-lifehack","tag-php"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/788","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=788"}],"version-history":[{"count":1,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/788\/revisions"}],"predecessor-version":[{"id":1712,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/788\/revisions\/1712"}],"wp:attachment":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/media?parent=788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/categories?post=788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/tags?post=788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}