{"id":91,"date":"2021-12-16T09:56:34","date_gmt":"2021-12-16T00:56:34","guid":{"rendered":"https:\/\/www.b64.pw\/blog\/?p=91"},"modified":"2021-12-16T09:56:34","modified_gmt":"2021-12-16T00:56:34","slug":"php8-1%e3%81%ae%e6%96%b0%e6%a9%9f%e8%83%bd%e7%b4%b9%e4%bb%8b-final-class-constants","status":"publish","type":"post","link":"https:\/\/www.b64.pw\/blog\/?p=91","title":{"rendered":"PHP8.1\u306e\u65b0\u6a5f\u80fd\u7d39\u4ecb Final class constants"},"content":{"rendered":"\n<p>\u3053\u308c\u3082\u5730\u5473\u306b\u3042\u308a\u304c\u305f\u3044\u7cfb\u306e\u8ffd\u52a0\u4ed5\u69d8\u3002<br>const\u306bfinal\u5ba3\u8a00\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u7d99\u627f\u5148\u306e\u30af\u30e9\u30b9\u3067\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u306a\u3063\u305f\u3002<\/p>\n\n\n\n<p>\u3080\u308a\u3084\u308a\u4e0b\u8a18\u306e\u3088\u3046\u306boverride\u3059\u308b\u3068Fatal error\u304c\u3067\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\r\n\r\nclass Base\r\n{\r\n    final public const URL = \"https:\/\/www.google.com\/\";\r\n}\r\n\r\nclass Child extends Base\r\n{\r\n    public const URL = \"https:\/\/www.google.co.jp\/\"; \/\/ Fatal error\r\n}\r\n\r<\/code><\/pre>\n\n\n\n<p><br>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b-l \u30aa\u30d7\u30b7\u30e7\u30f3\u3067linter\u306b\u304b\u3051\u308b\u3060\u3051\u3067\u3082\u691c\u51fa\u3067\u304d\u308b\u306e\u3082\u3042\u308a\u304c\u305f\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ php -l final_const.php\nFatal error: Child::URL cannot override final constant Base::URL in final_const.php on line 8\r\nErrors parsing final_const.php<\/code><\/pre>\n\n\n\n<p>\u306a\u304a\u30d7\u30ed\u30d1\u30c6\u30a3\u306ffinal\u5ba3\u8a00\u3067\u304d\u306a\u3044\u6a21\u69d8\u3002<\/p>\n\n\n\n<p>\u53c2\u8003: https:\/\/www.php.net\/manual\/en\/language.oop5.final.php#language.oop5.final.example.php81<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u308c\u3082\u5730\u5473\u306b\u3042\u308a\u304c\u305f\u3044\u7cfb\u306e\u8ffd\u52a0\u4ed5\u69d8\u3002const\u306bfinal\u5ba3 &#8230;<\/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\/91"}],"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=91"}],"version-history":[{"count":1,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/posts\/91\/revisions"}],"predecessor-version":[{"id":92,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=\/wp\/v2\/posts\/91\/revisions\/92"}],"wp:attachment":[{"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=91"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=91"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.b64.pw\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=91"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}