{"id":6996,"date":"2026-07-08T15:02:46","date_gmt":"2026-07-08T06:02:46","guid":{"rendered":"https:\/\/taitan916.info\/blog\/?p=6996"},"modified":"2025-11-08T15:08:20","modified_gmt":"2025-11-08T06:08:20","slug":"post-6996","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/6996","title":{"rendered":"PHP\u3067\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u306e\u53cd\u5bfe\u8272\u3092\u8a08\u7b97\u3057\u3001\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u3068\u3057\u3066\u51fa\u529b\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>\u3042\u308b\u30b7\u30b9\u30c6\u30e0\u5185\u3067\u30e6\u30fc\u30b6\u304c\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u3092CSS\u3067\u6307\u5b9a\u3057\u305f\u4e0a\u3067\u51fa\u529b\u3059\u308b\u3068\u3044\u3046\u30b1\u30fc\u30b9\u304c\u3042\u3063\u305f\u3002\u4f8b\u3048\u3070\u300c#ff0000\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u8d64\u3067\u8868\u793a\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u3002\u305f\u3060\u3001\u80cc\u666f\u8272\u306f\u767d\u3060\u3063\u305f\u305f\u3081\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u306f\u898b\u3065\u3089\u3044\u5834\u5408\u304c\u3042\u3063\u305f\u3002\u305d\u306e\u305f\u3081\u53cd\u5bfe\u8272\u3092\u81ea\u52d5\u3067\u8a08\u7b97\u3057\u3001\u80cc\u666f\u8272\u306b\u6307\u5b9a\u3057\u305f\u3044\u3002\u4ee5\u4e0b\u306b\u5bfe\u5fdc\u65b9\u6cd5\u3092\u30e1\u30e2\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u5bfe\u5fdc\u65b9\u6cd5<\/h2>\n<h3>\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">&lt;?php\r\nvar_dump(color_inverse('#ff0000')); \/\/string(7) \"#00ffff\"\r\nvar_dump(color_inverse('#00ff00')); \/\/string(7) \"#ff00ff\"\r\nvar_dump(color_inverse('#0000ff')); \/\/string(7) \"#ffff00\"\r\n\r\n\r\nfunction color_inverse($color){\r\n    $color = str_replace('#', '', $color);\r\n    if( strlen($color) != 6 ){\r\n        return '000000';\r\n    }\r\n    $rgb = '';\r\n    for( $x = 0; $x &lt; 3; $x++ ){\r\n        $c = 255 - hexdec(substr($color, (2 * $x), 2));\r\n        $c = ($c &lt; 0) ? 0 : dechex($c);\r\n        $rgb .= (strlen($c) &lt; 2) ? '0'.$c : $c;\r\n    }\r\n    return '#'.$rgb;\r\n}\r\n<\/pre>\n<p>&nbsp;<\/p>\n<h2>\u53c2\u8003\u30b5\u30a4\u30c8<\/h2>\n<p><a href=\"https:\/\/www.jonasjohn.de\/snippets\/php\/color-inverse.htm\" target=\"_blank\" rel=\"noopener\">https:\/\/www.jonasjohn.de\/snippets\/php\/color-inverse.htm<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3042\u308b\u30b7\u30b9\u30c6\u30e0\u5185\u3067\u30e6\u30fc\u30b6\u304c\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u3092CSS\u3067\u6307\u5b9a\u3057\u305f\u4e0a\u3067\u51fa\u529b\u3059\u308b\u3068\u3044\u3046 ... <\/p>\n","protected":false},"author":1,"featured_media":1085,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-6996","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6996","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/comments?post=6996"}],"version-history":[{"count":1,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6996\/revisions"}],"predecessor-version":[{"id":6997,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6996\/revisions\/6997"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media\/1085"}],"wp:attachment":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media?parent=6996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/categories?post=6996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/tags?post=6996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}