docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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+---
+id: php-superglobals-request
+title: "PHP Superglobals Request"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["$_REQUEST", "PHP 요청 슈퍼글로벌"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "superglobals", "request", "security"]
+raw_sources: ["https://www.w3schools.com/php/php_superglobals_request.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP Superglobals Request]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`$_REQUEST`'s convenience is explicitly flagged as a security liability — because it silently merges GET, POST, and COOKIE data into one array, the source recommends using the more specific `$_GET`/`$_POST`/`$_COOKIE` superglobals whenever possible, since `$_REQUEST` can't distinguish where a value actually came from. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`$_REQUEST`** — combines data from `$_GET`, `$_POST`, and `$_COOKIE` into one array. [S1]
+- **Security caveat** — combining sources makes it harder to know a value's origin, a potential vulnerability; prefer the specific superglobals when possible. [S1]
+- **`htmlspecialchars()`** — sanitizes output to prevent XSS when echoing user-submitted data. [S1]
+- **Works for both POST forms and GET query strings/forms** — the same `$_REQUEST[key]` syntax retrieves data regardless of submission method. [S1]
+
+## 📖 세부 내용 (Details)
+- POST form + $_REQUEST: `<form method="post" action="...">... <?php $name = htmlspecialchars($_REQUEST['fname']); ?>`. [S1]
+- GET query string + $_REQUEST(via $_GET in this example): `<a href="demo_phpfile.php?subject=PHP&web=W3schools.com">Test $GET</a>` then `$subject = htmlspecialchars($_GET['subject']);`. [S1]
+- Self-submitting form pattern: `<form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **$_REQUEST의 보안 취약점**: GET/POST/COOKIE를 한데 섞기 때문에 값의 출처를 구분하기 어려워 보안 취약점이 될 수 있으며, 가능하면 구체적인 슈퍼글로벌을 쓰라고 권장됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — htmlspecialchars()로 사용자 입력을 이스케이프해 XSS를 방지하는 것이 필수 보안 관행이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Sanitizing form input with htmlspecialchars() (PHP):
+```php
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $name = htmlspecialchars($_REQUEST['fname']);
+    echo empty($name) ? "Name is empty" : $name;
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[PHP Tutorial]]
+- **관련 개념:** [[PHP Superglobals Post]], [[PHP Superglobals Get]], [[PHP Form Validation]]
+- **참조 맥락:** 통합 요청 데이터 접근 — $_POST 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP $_REQUEST Superglobal — https://www.w3schools.com/php/php_superglobals_request.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP $_REQUEST Superglobal" page (Astra wiki-curation, P-Reinforce v3.1 format).