{"id":778,"date":"2025-08-04T16:13:44","date_gmt":"2025-08-04T07:13:44","guid":{"rendered":"https:\/\/nexive.tech\/?p=778"},"modified":"2025-08-04T16:13:45","modified_gmt":"2025-08-04T07:13:45","slug":"%e3%80%90%e3%82%b5%e3%82%af%e3%83%83%e3%81%a8%e8%a7%a3%e8%aa%ac%e3%80%91php-%e3%82%a2%e3%82%af%e3%82%bb%e3%82%b9%e4%bf%ae%e9%a3%be%e5%ad%90%e3%81%ae%e4%bd%bf%e3%81%84%e5%88%86%e3%81%91%ef%bc%88public","status":"publish","type":"post","link":"https:\/\/nexive.tech\/?p=778","title":{"rendered":"\u3010\u30b5\u30af\u30c3\u3068\u89e3\u8aac\u3011PHP \u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306e\u4f7f\u3044\u5206\u3051\uff08public \/ private \/ protected\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. \u672c\u8a18\u4e8b\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PHP\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\uff08public \/ protected \/ private\uff09\u306e\u57fa\u672c\u7684\u306a\u610f\u5473\u3068\u9055\u3044\u3092\u6574\u7406<\/li>\n\n\n\n<li>\u5b9f\u52d9\u3067\u306e\u4f7f\u3044\u5206\u3051\u3068\u3001\u8a2d\u8a08\u610f\u56f3\u306b\u57fa\u3065\u304f\u9078\u629e\u57fa\u6e96\u3092\u660e\u793a<\/li>\n\n\n\n<li>\u9593\u9055\u3044\u3084\u3059\u3044\u7d99\u627f\u6642\u306e\u6319\u52d5\u3084\u30a2\u30af\u30bb\u30b9\u5236\u9650\u306e\u76f2\u70b9\u3082\u88dc\u8db3<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. PHP\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>PHP\u306b\u304a\u3051\u308b\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\uff08\u30a2\u30af\u30bb\u30b9\u6a29\uff09\u306f\u3001\u30af\u30e9\u30b9\u5185\u90e8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u306e<strong>\u5916\u90e8\u304b\u3089\u306e\u53c2\u7167\u53ef\u80fd\u7bc4\u56f2<\/strong>\u3092\u5236\u5fa1\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3067\u3059\u3002\u4e3b\u306b\u300c\u30ab\u30d7\u30bb\u30eb\u5316\uff08\u60c5\u5831\u96a0\u853d\uff09\u300d\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>PHP\u3067\u306f\u4ee5\u4e0b\u306e3\u7a2e\u985e\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>public<\/code>: \u3069\u3053\u304b\u3089\u3067\u3082\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\uff08\u5916\u90e8\u30fb\u7d99\u627f\u5148\u30fb\u30af\u30e9\u30b9\u5185\uff09<\/li>\n\n\n\n<li><code>protected<\/code>: \u540c\u4e00\u30af\u30e9\u30b9\u304a\u3088\u3073\u7d99\u627f\u5148\u30af\u30e9\u30b9\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/li>\n\n\n\n<li><code>private<\/code>: \u5ba3\u8a00\u3055\u308c\u305f\u30af\u30e9\u30b9\u5185\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\uff08\u7d99\u627f\u5148\u3067\u3082\u4e0d\u53ef\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u306e\u6a5f\u80fd\u306b\u3088\u308a\u3001\u5185\u90e8\u7684\u306a\u51e6\u7406\u3092\u96a0\u853d\u3057\u305f\u308a\u3001\u610f\u56f3\u3057\u306a\u3044\u4f7f\u3044\u65b9\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u5927\u898f\u6a21\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u610f\u56f3\u3057\u306a\u3044\u526f\u4f5c\u7528\u306e\u6291\u5236\u3084\u4fdd\u5b88\u6027\u5411\u4e0a\u306b\u5bc4\u4e0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u8a73\u7d30\u89e3\u8aac<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u4f7f\u3044\u5206\u3051\uff1a\u3069\u3053\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3055\u305b\u305f\u3044\u304b\u3067\u9078\u3076<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306e\u9055\u3044\u3092\u30b7\u30f3\u30d7\u30eb\u306a\u30af\u30e9\u30b9\u5b9a\u7fa9\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:16px 0 0 16px;width:100%;text-align:left;background-color:#1e1e1e\"><span style=\"background:#c7c7c7;padding:0.3rem 0.5rem 0.2rem;border-radius:1rem;font-size:0.8em;line-height:1;height:1.25rem;text-align:center;display:inline-flex;align-items:center;justify-content:center;color:#1e1e1e\">PHP<\/span><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>class Sample {\n    public $a = \"\u516c\u958b\";          \/\/ \u3069\u3053\u304b\u3089\u3067\u3082\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\n    protected $b = \"\u4fdd\u8b77\";       \/\/ \u7d99\u627f\u5148\u307e\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\n    private $c = \"\u975e\u516c\u958b\";       \/\/ \u540c\u4e00\u30af\u30e9\u30b9\u5185\u306e\u307f\n\n    public function showAll() {\n        echo $this->a; \/\/ OK\n        echo $this->b; \/\/ OK\n        echo $this->c; \/\/ OK\n    }\n}\n\n$obj = new Sample();\necho $obj->a;     \/\/ OK\n\/\/ echo $obj->b;  \/\/ \u30a8\u30e9\u30fc: protected\n\/\/ echo $obj->c;  \/\/ \u30a8\u30e9\u30fc: private\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Sample<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">public<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$a<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;\u516c\u958b&quot;<\/span><span style=\"color: #D4D4D4\">;          <\/span><span style=\"color: #6A9955\">\/\/ \u3069\u3053\u304b\u3089\u3067\u3082\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">protected<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$b<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;\u4fdd\u8b77&quot;<\/span><span style=\"color: #D4D4D4\">;       <\/span><span style=\"color: #6A9955\">\/\/ \u7d99\u627f\u5148\u307e\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">private<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$c<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;\u975e\u516c\u958b&quot;<\/span><span style=\"color: #D4D4D4\">;       <\/span><span style=\"color: #6A9955\">\/\/ \u540c\u4e00\u30af\u30e9\u30b9\u5185\u306e\u307f<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">public<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">function<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">showAll<\/span><span style=\"color: #D4D4D4\">() {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">$this<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">a<\/span><span style=\"color: #D4D4D4\">; <\/span><span style=\"color: #6A9955\">\/\/ OK<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">$this<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">b<\/span><span style=\"color: #D4D4D4\">; <\/span><span style=\"color: #6A9955\">\/\/ OK<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">$this<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">c<\/span><span style=\"color: #D4D4D4\">; <\/span><span style=\"color: #6A9955\">\/\/ OK<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$obj<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #569CD6\">new<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Sample<\/span><span style=\"color: #D4D4D4\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$obj<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">a<\/span><span style=\"color: #D4D4D4\">;     <\/span><span style=\"color: #6A9955\">\/\/ OK<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/ echo $obj-&gt;b;  \/\/ \u30a8\u30e9\u30fc: protected<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/ echo $obj-&gt;c;  \/\/ \u30a8\u30e9\u30fc: private<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u7d99\u627f\u6642\u306e\u6319\u52d5\uff1aprotected\u3068private\u306e\u9055\u3044<\/h3>\n\n\n\n<p>\u7d99\u627f\u6642\u306e\u30a2\u30af\u30bb\u30b9\u5236\u9650\u306e\u5dee\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:16px 0 0 16px;width:100%;text-align:left;background-color:#1e1e1e\"><span style=\"background:#c7c7c7;padding:0.3rem 0.5rem 0.2rem;border-radius:1rem;font-size:0.8em;line-height:1;height:1.25rem;text-align:center;display:inline-flex;align-items:center;justify-content:center;color:#1e1e1e\">PHP<\/span><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>class ParentClass {\n    protected $val1 = \"\u7d99\u627fOK\";\n    private $val2 = \"\u7d99\u627f\u4e0d\u53ef\";\n}\n\nclass ChildClass extends ParentClass {\n    public function display() {\n        echo $this->val1; \/\/ OK\n        \/\/ echo $this->val2; \/\/ \u30a8\u30e9\u30fc: private\u306f\u7d99\u627f\u5148\u3067\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef\n    }\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">ParentClass<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">protected<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$val1<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;\u7d99\u627fOK&quot;<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">private<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$val2<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;\u7d99\u627f\u4e0d\u53ef&quot;<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">ChildClass<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">extends<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">ParentClass<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">public<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">function<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">display<\/span><span style=\"color: #D4D4D4\">() {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">$this<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">val1<\/span><span style=\"color: #D4D4D4\">; <\/span><span style=\"color: #6A9955\">\/\/ OK<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #6A9955\">\/\/ echo $this-&gt;val2; \/\/ \u30a8\u30e9\u30fc: private\u306f\u7d99\u627f\u5148\u3067\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<code>protected<\/code> \u306f\u7d99\u627f\u5148\u30af\u30e9\u30b9\u304b\u3089\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3059\u304c\u3001<code>private<\/code> \u306f\u5b8c\u5168\u306b\u5916\u90e8\u975e\u516c\u958b\u3067\u3042\u308b\u305f\u3081\u3001\u7d99\u627f\u5148\u304b\u3089\u3082\u898b\u3048\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30e1\u30bd\u30c3\u30c9\u306b\u3082\u4f7f\u3048\u308b\uff1a\u5185\u90e8\u5c02\u7528\u30e1\u30bd\u30c3\u30c9\u306e\u96a0\u853d<\/h3>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u306b\u3082\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002\u5916\u90e8\u306b\u898b\u305b\u305f\u304f\u306a\u3044\u51e6\u7406\u30ed\u30b8\u30c3\u30af\u3092 <code>private<\/code> \u306b\u3059\u308b\u3053\u3068\u3067\u3001\u610f\u56f3\u3057\u306a\u3044\u5229\u7528\u3092\u9632\u3052\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:16px 0 0 16px;width:100%;text-align:left;background-color:#1e1e1e\"><span style=\"background:#c7c7c7;padding:0.3rem 0.5rem 0.2rem;border-radius:1rem;font-size:0.8em;line-height:1;height:1.25rem;text-align:center;display:inline-flex;align-items:center;justify-content:center;color:#1e1e1e\">PHP<\/span><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>class Logger {\n    public function log($msg) {\n        $this->writeLog($msg);\n    }\n\n    private function writeLog($msg) {\n        echo \"&#91;LOG&#93; $msg\";\n    }\n}\n\n$logger = new Logger();\n$logger->log(\"\u51e6\u7406\u958b\u59cb\");       \/\/ OK\n\/\/ $logger->writeLog(\"\u76f4\u63a5\u547c\u3073\u51fa\u3057\"); \/\/ \u30a8\u30e9\u30fc\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Logger<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">public<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">function<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">log<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$msg<\/span><span style=\"color: #D4D4D4\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #569CD6\">$this<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #DCDCAA\">writeLog<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$msg<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">private<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">function<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">writeLog<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$msg<\/span><span style=\"color: #D4D4D4\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;&#91;LOG&#93; <\/span><span style=\"color: #9CDCFE\">$msg<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$logger<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #569CD6\">new<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Logger<\/span><span style=\"color: #D4D4D4\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$logger<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #DCDCAA\">log<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u51e6\u7406\u958b\u59cb&quot;<\/span><span style=\"color: #D4D4D4\">);       <\/span><span style=\"color: #6A9955\">\/\/ OK<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/ $logger-&gt;writeLog(&quot;\u76f4\u63a5\u547c\u3073\u51fa\u3057&quot;); \/\/ \u30a8\u30e9\u30fc<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u516c\u958b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092 <code>public<\/code> \u306b\u9650\u5b9a\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u51e6\u7406\u306f <code>private<\/code> \u307e\u305f\u306f <code>protected<\/code> \u306b\u3059\u308b\u3053\u3068\u3067\u3001API\u306e\u660e\u78ba\u5316\u3068\u5b89\u5168\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u3088\u304f\u3042\u308b\u30df\u30b9\u30fb\u8aa4\u89e3\u30fb\u843d\u3068\u3057\u7a74<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">private\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u518d\u5b9a\u7fa9\u306b\u3088\u308b\u6df7\u4e71<\/h3>\n\n\n\n<p>\u89aa\u30af\u30e9\u30b9\u3068\u5b50\u30af\u30e9\u30b9\u3067\u540c\u3058\u540d\u524d\u306e <code>private<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5b9a\u7fa9\u3059\u308b\u3068\u3001<strong>\u5b8c\u5168\u306b\u5225\u7269\u3068\u3057\u3066\u6271\u308f\u308c<\/strong>\u3001\u4e88\u671f\u3057\u306a\u3044\u6319\u52d5\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:16px 0 0 16px;width:100%;text-align:left;background-color:#1e1e1e\"><span style=\"background:#c7c7c7;padding:0.3rem 0.5rem 0.2rem;border-radius:1rem;font-size:0.8em;line-height:1;height:1.25rem;text-align:center;display:inline-flex;align-items:center;justify-content:center;color:#1e1e1e\">PHP<\/span><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>class Base {\n    private $val = \"base\";\n    public function getVal() {\n        return $this->val;\n    }\n}\n\nclass Sub extends Base {\n    private $val = \"sub\";\n}\n\n$obj = new Sub();\necho $obj->getVal(); \/\/ \"base\" \u304c\u51fa\u529b\u3055\u308c\u308b\uff08\"sub\" \u3067\u306f\u306a\u3044\uff09\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Base<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">private<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$val<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;base&quot;<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">public<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">function<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">getVal<\/span><span style=\"color: #D4D4D4\">() {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">$this<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">val<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Sub<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">extends<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Base<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">private<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$val<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #CE9178\">&quot;sub&quot;<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$obj<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #569CD6\">new<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Sub<\/span><span style=\"color: #D4D4D4\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">$obj<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #DCDCAA\">getVal<\/span><span style=\"color: #D4D4D4\">(); <\/span><span style=\"color: #6A9955\">\/\/ &quot;base&quot; \u304c\u51fa\u529b\u3055\u308c\u308b\uff08&quot;sub&quot; \u3067\u306f\u306a\u3044\uff09<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u540c\u3058 <code>$val<\/code> \u3067\u3082\u30b9\u30b3\u30fc\u30d7\u304c\u7570\u306a\u308b\u305f\u3081\u3001\u4e0a\u66f8\u304d\u3084\u53c2\u7167\u306e\u610f\u56f3\u304c\u53cd\u6620\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">protected\u3092\u4f7f\u3063\u305f\u3064\u3082\u308a\u304c\u3001\u30a2\u30af\u30bb\u30b9\u30a8\u30e9\u30fc\u306b\u306a\u308b\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<p>\u7d99\u627f\u95a2\u4fc2\u306b\u3042\u308b\u30af\u30e9\u30b9\u9593\u3067\u3082\u3001\u610f\u56f3\u305b\u305a <code>private<\/code> \u3092\u6307\u5b9a\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u30a2\u30af\u30bb\u30b9\u3067\u304d\u305a\u306b\u4f8b\u5916\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001\u7d99\u627f\u5148\u3067\u5229\u7528\u3092\u524d\u63d0\u3068\u3059\u308b\u5834\u5408\u306f <code>protected<\/code> \u3092\u9078\u3076\u306e\u304c\u57fa\u672c\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u307e\u3068\u3081<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>public<\/code> \u306f\u5916\u90e8\u516c\u958b\u3001<code>protected<\/code> \u306f\u7d99\u627f\u524d\u63d0\u3001<code>private<\/code> \u306f\u5b8c\u5168\u306b\u975e\u516c\u958b<\/li>\n\n\n\n<li>\u5b9f\u52d9\u3067\u306f\u300c\u5916\u90e8API\u306a\u306e\u304b\u300d\u300c\u5185\u90e8\u5b9f\u88c5\u306a\u306e\u304b\u300d\u3067\u4f7f\u3044\u5206\u3051\u308b\u306e\u304c\u57fa\u672c<\/li>\n\n\n\n<li>\u30af\u30e9\u30b9\u8a2d\u8a08\u6642\u306f\u3001<strong>\u516c\u958b\u7bc4\u56f2\u3092\u610f\u56f3\u7684\u306b\u72ed\u3081\u308b<\/strong>\u65b9\u304c\u5b89\u5168<\/li>\n\n\n\n<li>\u7d99\u627f\u6642\u306e <code>private<\/code> \u306e\u6271\u3044\u3084\u3001\u540c\u540d\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u518d\u5b9a\u7fa9\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>1. \u672c\u8a18\u4e8b\u306e\u30dd\u30a4\u30f3\u30c8 2. PHP\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3068\u306f\uff1f PHP\u306b\u304a\u3051\u308b\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\uff08\u30a2\u30af\u30bb\u30b9\u6a29\uff09\u306f\u3001\u30af\u30e9\u30b9\u5185\u90e8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u5916\u90e8\u304b\u3089\u306e\u53c2\u7167\u53ef\u80fd\u7bc4\u56f2\u3092\u5236\u5fa1\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3067\u3059\u3002\u4e3b\u306b\u300c\u30ab\u30d7\u30bb\u30eb\u5316\uff08\u60c5\u5831\u96a0\u853d\uff09\u300d\u3092 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":698,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[85],"tags":[],"class_list":["post-778","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/posts\/778","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nexive.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=778"}],"version-history":[{"count":2,"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/posts\/778\/revisions"}],"predecessor-version":[{"id":873,"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/posts\/778\/revisions\/873"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nexive.tech\/index.php?rest_route=\/wp\/v2\/media\/698"}],"wp:attachment":[{"href":"https:\/\/nexive.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nexive.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nexive.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}