{"id":806,"date":"2025-08-04T16:24:02","date_gmt":"2025-08-04T07:24:02","guid":{"rendered":"https:\/\/nexive.tech\/?p=806"},"modified":"2025-08-04T16:25:55","modified_gmt":"2025-08-04T07:25:55","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-html%e3%83%95%e3%82%a9%e3%83%bc%e3%83%a0%e3%81%8b%e3%82%89%e3%81%aepost%e3%83%87%e3%83%bc%e3%82%bf%e5%8f%97%e3%81%91","status":"publish","type":"post","link":"https:\/\/nexive.tech\/?p=806","title":{"rendered":"\u3010\u30b5\u30af\u30c3\u3068\u89e3\u8aac\u3011PHP HTML\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u306ePOST\u30c7\u30fc\u30bf\u53d7\u3051\u53d6\u308a\u65b9\u6cd5"},"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\u3067HTML\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u9001\u4fe1\u3055\u308c\u305fPOST\u30c7\u30fc\u30bf\u3092\u5b89\u5168\u306b\u53d7\u3051\u53d6\u308b\u65b9\u6cd5\u3092\u89e3\u8aac<\/li>\n\n\n\n<li>$_POST\u306e\u57fa\u672c\u4ed5\u69d8\u3068\u4f7f\u3044\u65b9\u3001\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u5fc5\u8981\u6027\u306b\u89e6\u308c\u308b<\/li>\n\n\n\n<li>\u30d5\u30a9\u30fc\u30e0\u9001\u4fe1\u51e6\u7406\u306e\u5178\u578b\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. PHP\u3067HTML\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u306ePOST\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>PHP\u3067\u306f\u3001HTML\u306eform\u8981\u7d20\u304b\u3089\u9001\u4fe1\u3055\u308c\u305fPOST\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u3001<code>$_POST<\/code>\u3068\u3044\u3046\u30b9\u30fc\u30d1\u30fc\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u4f7f\u3063\u3066\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001HTTP\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066<code>POST<\/code>\u3092\u6307\u5b9a\u3057\u305f\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u9001\u3089\u308c\u3066\u304f\u308b\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u9023\u60f3\u914d\u5217\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5178\u578b\u7684\u306b\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30d5\u30a9\u30fc\u30e0\u306b\u5165\u529b\u3057\u305f\u5024\uff08\u4f8b\uff1a\u540d\u524d\u3084\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306a\u3069\uff09\u3092\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3067\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u306e\u767b\u9332\u3001\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3084CSRF\u5bfe\u7b56\u3001\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u3044\u3063\u305f\u51e6\u7406\u306e\u5165\u308a\u53e3\u3068\u3057\u3066\u4f7f\u308f\u308c\u308b\u91cd\u8981\u306a\u6a5f\u80fd\u3067\u3059\u3002\u5358\u7d14\u306a\u5909\u6570\u53d6\u5f97\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3084\u610f\u56f3\u3057\u306a\u3044\u6319\u52d5\u3092\u9632\u3050\u305f\u3081\u306e\u914d\u616e\u304c\u6b20\u304b\u305b\u307e\u305b\u3093\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\">\u6700\u3082\u57fa\u672c\u7684\u306aPOST\u30c7\u30fc\u30bf\u306e\u53d7\u3051\u53d6\u308a<\/h3>\n\n\n\n<p>\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u9001\u4fe1\u3055\u308c\u305f\u540d\u524d\u3068\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u53d7\u3051\u53d6\u308a\u3001\u753b\u9762\u306b\u51fa\u529b\u3059\u308b\u7c21\u5358\u306a\u4f8b\u3067\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(1 * 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\">HTML<\/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>&lt;!-- form.html -->\n&lt;form action=\"submit.php\" method=\"post\">\n  &lt;input type=\"text\" name=\"username\">\n  &lt;input type=\"email\" name=\"email\">\n  &lt;input type=\"submit\" value=\"\u9001\u4fe1\">\n&lt;\/form>\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: #6A9955\">&lt;!-- form.html --&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">form<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">action<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;submit.php&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">method<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;post&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">input<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">type<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;text&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">name<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;username&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">input<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">type<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;email&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">name<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;email&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">input<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">type<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;submit&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">value<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;\u9001\u4fe1&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #808080\">&lt;\/<\/span><span style=\"color: #569CD6\">form<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\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(1 * 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>\/\/ submit.php\n\/\/ \u30d5\u30a9\u30fc\u30e0\u304b\u3089\u9001\u3089\u308c\u305fPOST\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\n$username = $_POST&#91;'username'&#93;;\n$email = $_POST&#91;'email'&#93;;\n\n\/\/ \u7c21\u6613\u7684\u306b\u753b\u9762\u51fa\u529b\uff08\u5b9f\u52d9\u3067\u306fXSS\u5bfe\u7b56\u304c\u5fc5\u8981\uff09\necho \"\u540d\u524d: \" . htmlspecialchars($username, ENT_QUOTES, 'UTF-8') . \"&lt;br>\";\necho \"\u30e1\u30fc\u30eb: \" . htmlspecialchars($email, ENT_QUOTES, 'UTF-8');\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A9955\">\/\/ submit.php<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/ \u30d5\u30a9\u30fc\u30e0\u304b\u3089\u9001\u3089\u308c\u305fPOST\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b<\/span><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$username<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;username&#39;<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$email<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;email&#39;<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/ \u7c21\u6613\u7684\u306b\u753b\u9762\u51fa\u529b\uff08\u5b9f\u52d9\u3067\u306fXSS\u5bfe\u7b56\u304c\u5fc5\u8981\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;\u540d\u524d: &quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">htmlspecialchars<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$username<\/span><span style=\"color: #D4D4D4\">, ENT_QUOTES, <\/span><span style=\"color: #CE9178\">&#39;UTF-8&#39;<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;&lt;br&gt;&quot;<\/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: #CE9178\">&quot;\u30e1\u30fc\u30eb: &quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">htmlspecialchars<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$email<\/span><span style=\"color: #D4D4D4\">, ENT_QUOTES, <\/span><span style=\"color: #CE9178\">&#39;UTF-8&#39;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u3068\u7a7a\u5224\u5b9a\u3092\u52a0\u3048\u308b\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>POST\u3055\u308c\u305f\u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306e\u30a8\u30e9\u30fc\u3092\u9632\u304e\u307e\u3059\u3002\u5b9f\u52d9\u3067\u306f\u5fc5\u9808\u306e\u5bfe\u7b56\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:16px 0 0 16px;width:100%;text-align:left;background-color:#1e1e1e\"><span style=\"background:#c7c7c7;padding:0.3rem 0.5rem 0.2rem;border-radius:1rem;font-size:0.8em;line-height:1;height:1.25rem;text-align:center;display:inline-flex;align-items:center;justify-content:center;color:#1e1e1e\">PHP<\/span><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>\/\/ POST\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u3092\u78ba\u8a8d\nif (isset($_POST&#91;'username'&#93;) &amp;&amp; isset($_POST&#91;'email'&#93;)) {\n    $username = trim($_POST&#91;'username'&#93;);\n    $email = trim($_POST&#91;'email'&#93;);\n\n    if ($username === '' || $email === '') {\n        echo \"\u5165\u529b\u5024\u304c\u4e0d\u8db3\u3057\u3066\u3044\u307e\u3059\u3002\";\n    } else {\n        echo \"\u540d\u524d: \" . htmlspecialchars($username, ENT_QUOTES, 'UTF-8') . \"&lt;br>\";\n        echo \"\u30e1\u30fc\u30eb: \" . htmlspecialchars($email, ENT_QUOTES, 'UTF-8');\n    }\n} else {\n    echo \"\u30d5\u30a9\u30fc\u30e0\u30c7\u30fc\u30bf\u304c\u9001\u4fe1\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\";\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A9955\">\/\/ POST\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u3092\u78ba\u8a8d<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #DCDCAA\">isset<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;username&#39;<\/span><span style=\"color: #D4D4D4\">&#93;) &amp;&amp; <\/span><span style=\"color: #DCDCAA\">isset<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;email&#39;<\/span><span style=\"color: #D4D4D4\">&#93;)) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">$username<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">trim<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;username&#39;<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">$email<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">trim<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;email&#39;<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #9CDCFE\">$username<\/span><span style=\"color: #D4D4D4\"> === <\/span><span style=\"color: #CE9178\">&#39;&#39;<\/span><span style=\"color: #D4D4D4\"> || <\/span><span style=\"color: #9CDCFE\">$email<\/span><span style=\"color: #D4D4D4\"> === <\/span><span style=\"color: #CE9178\">&#39;&#39;<\/span><span style=\"color: #D4D4D4\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;\u5165\u529b\u5024\u304c\u4e0d\u8db3\u3057\u3066\u3044\u307e\u3059\u3002&quot;<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    } <\/span><span style=\"color: #C586C0\">else<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">echo<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;\u540d\u524d: &quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">htmlspecialchars<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$username<\/span><span style=\"color: #D4D4D4\">, ENT_QUOTES, <\/span><span style=\"color: #CE9178\">&#39;UTF-8&#39;<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;&lt;br&gt;&quot;<\/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;\u30e1\u30fc\u30eb: &quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">htmlspecialchars<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$email<\/span><span style=\"color: #D4D4D4\">, ENT_QUOTES, <\/span><span style=\"color: #CE9178\">&#39;UTF-8&#39;<\/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 style=\"color: #C586C0\">else<\/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;\u30d5\u30a9\u30fc\u30e0\u30c7\u30fc\u30bf\u304c\u9001\u4fe1\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002&quot;<\/span><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<h3 class=\"wp-block-heading\">CSRF\u30c8\u30fc\u30af\u30f3\u306b\u3088\u308bPOST\u6b63\u5f53\u6027\u306e\u691c\u8a3c<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u74b0\u5883\u3067\u306f\u3001\u30d5\u30a9\u30fc\u30e0\u9001\u4fe1\u304c\u610f\u56f3\u3057\u305f\u64cd\u4f5c\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c\u3059\u308b\u5fc5\u8981\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(1 * 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>\/\/ \u30d5\u30a9\u30fc\u30e0\u57cb\u3081\u8fbc\u307f\uff08\u4f8b\uff09\nsession_start();\n$token = bin2hex(random_bytes(32));\n$_SESSION&#91;'token'&#93; = $token;\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A9955\">\/\/ \u30d5\u30a9\u30fc\u30e0\u57cb\u3081\u8fbc\u307f\uff08\u4f8b\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">session_start<\/span><span style=\"color: #D4D4D4\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$token<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">bin2hex<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #DCDCAA\">random_bytes<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #B5CEA8\">32<\/span><span style=\"color: #D4D4D4\">));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #9CDCFE\">$_SESSION<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;token&#39;<\/span><span style=\"color: #D4D4D4\">&#93; = <\/span><span style=\"color: #9CDCFE\">$token<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\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(1 * 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\">HTML<\/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>&lt;form method=\"post\" action=\"submit.php\">\n  &lt;input type=\"hidden\" name=\"token\" value=\"&lt;?= htmlspecialchars($token) ?>\">\n  &lt;input type=\"text\" name=\"username\">\n  &lt;input type=\"submit\">\n&lt;\/form>\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: #808080\">&lt;<\/span><span style=\"color: #569CD6\">form<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">method<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;post&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">action<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;submit.php&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">input<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">type<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;hidden&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">name<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;token&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">value<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #F44747\">&lt;<\/span><span style=\"color: #CE9178\">?= htmlspecialchars($token) ?&gt;&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">input<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">type<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;text&quot;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">name<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;username&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #808080\">&lt;<\/span><span style=\"color: #569CD6\">input<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">type<\/span><span style=\"color: #D4D4D4\">=<\/span><span style=\"color: #CE9178\">&quot;submit&quot;<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #808080\">&lt;\/<\/span><span style=\"color: #569CD6\">form<\/span><span style=\"color: #808080\">&gt;<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\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(1 * 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>\/\/ submit.php\nsession_start();\nif (!isset($_POST&#91;'token'&#93;, $_SESSION&#91;'token'&#93;) || $_POST&#91;'token'&#93; !== $_SESSION&#91;'token'&#93;) {\n    die('\u4e0d\u6b63\u306a\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u3059');\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A9955\">\/\/ submit.php<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">session_start<\/span><span style=\"color: #D4D4D4\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (!<\/span><span style=\"color: #DCDCAA\">isset<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;token&#39;<\/span><span style=\"color: #D4D4D4\">&#93;, <\/span><span style=\"color: #9CDCFE\">$_SESSION<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;token&#39;<\/span><span style=\"color: #D4D4D4\">&#93;) || <\/span><span style=\"color: #9CDCFE\">$_POST<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;token&#39;<\/span><span style=\"color: #D4D4D4\">&#93; !== <\/span><span style=\"color: #9CDCFE\">$_SESSION<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #CE9178\">&#39;token&#39;<\/span><span style=\"color: #D4D4D4\">&#93;) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">die<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&#39;\u4e0d\u6b63\u306a\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u3059&#39;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u3088\u304f\u3042\u308b\u30df\u30b9\u30fb\u8aa4\u89e3\u30fb\u843d\u3068\u3057\u7a74<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">$_POST\u306e\u76f4\u63a5\u4f7f\u7528\u306b\u3088\u308bXSS\u30ea\u30b9\u30af<\/h3>\n\n\n\n<p>HTML\u306b\u51fa\u529b\u3059\u308b\u969b\u306b\u30a8\u30b9\u30b1\u30fc\u30d7\u51e6\u7406\u3092\u884c\u308f\u306a\u3044\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u60aa\u610f\u306e\u3042\u308b\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u57cb\u3081\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5fc5\u305a<code>htmlspecialchars()<\/code>\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672a\u5b9a\u7fa9\u30ad\u30fc\u53c2\u7167\u306b\u3088\u308bWarning<\/h3>\n\n\n\n<p><code>$_POST['key']<\/code>\u3067\u672a\u5b9a\u7fa9\u306e\u30ad\u30fc\u3092\u53c2\u7167\u3059\u308b\u3068\u3001PHP Warning\u304c\u767a\u751f\u3057\u307e\u3059\u3002<code>isset()<\/code>\u306b\u3088\u308b\u4e8b\u524d\u78ba\u8a8d\u304c\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<h3 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