{"id":303,"date":"2022-06-29T08:52:37","date_gmt":"2022-06-28T23:52:37","guid":{"rendered":"https:\/\/www.b64.pw\/blog\/?p=303"},"modified":"2022-06-29T08:52:38","modified_gmt":"2022-06-28T23:52:38","slug":"php8-1%e3%81%a7%e3%81%aestatic%e5%a4%89%e6%95%b0%e3%81%ae%e6%8c%99%e5%8b%95%e3%81%8c%e5%a4%89%e3%82%8f%e3%81%a3%e3%81%a6%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.b64.pw\/blog\/?p=303","title":{"rendered":"PHP8.1\u3067\u306estatic\u5909\u6570\u306e\u6319\u52d5\u304c\u5909\u308f\u3063\u3066\u308b"},"content":{"rendered":"\n

\u3057\u308c\u3063\u3068\u3053\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u5927\u304d\u306a\u5909\u66f4\u5165\u308c\u3066\u304d\u3066\u308b<\/p>\n\n\n\n

\u95a2\u6570\u5185\u306bstatic\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u5834\u5408\u304c\u5f71\u97ff\u53d7\u3051\u308b\u3002<\/p>\n\n\n\n

\u5f93\u6765\u901a\u308a\u306e\u6319\u52d5\u306b\u8fd1\u304f\u3059\u308b\u306b\u306fprotected static $member_counter\u306e\u3088\u3046\u306a\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u306a\u30e1\u30f3\u30d0\u5909\u6570\u3092\u5b9a\u7fa9\u3057\u3066\u305d\u308c\u3092
static<\/strong>::$member_counter\u3068\u3044\u3046\u98a8\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308c\u3070\u3088\u3044(self::\u3060\u3068\u30c0\u30e1)<\/p>\n\n\n\n

<?php\n\nclass A {\n    protected static $member_counter = 0;\n    public static function counter() {\n        static $counter = 0;\n        $counter++;\n        return $counter;\n    }\n    public static function member_counter(){\n        static::$member_counter++;\n        return static::$member_counter;\n    }\n}\nclass B extends A {\n    protected static $member_counter = 0;\n}\nvar_dump(A::counter()); \/\/ int(1)\nvar_dump(A::counter()); \/\/ int(2)\nvar_dump(B::counter()); \/\/ int(3), previously int(1)\nvar_dump(B::counter()); \/\/ int(4), previously int(2)\necho '======================='.PHP_EOL;\nvar_dump(A::member_counter()); \/\/ int(1)\nvar_dump(A::member_counter()); \/\/ int(2)\nvar_dump(B::member_counter()); \/\/ int(1)\nvar_dump(B::member_counter()); \/\/ int(2)\n<\/code><\/pre><\/div>\n\n\n\n
\u5b9f\u884c\u4f8b<\/p>\n\n\n\n
https:\/\/3v4l.org\/aWqn0<\/a><\/p>\n\n\n\n
\u53c2\u8003<\/p>\n\n\n\n
https:\/\/www.php.net\/manual\/en\/migration81.incompatible.php<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u3057\u308c\u3063\u3068\u3053\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u5927\u304d\u306a\u5909\u66f4\u5165\u308c\u3066\u304d\u3066\u308b \u95a2\u6570\u5185\u306bsta …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/posts\/303"}],"collection":[{"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=303"}],"version-history":[{"count":3,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/posts\/303\/revisions"}],"predecessor-version":[{"id":306,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/posts\/303\/revisions\/306"}],"wp:attachment":[{"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}