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-cookies
+title: "PHP Cookies"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["setcookie()", "$_COOKIE", "PHP 쿠키"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "cookies"]
+raw_sources: ["https://www.w3schools.com/php/php_cookies.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP Cookies]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`setcookie()` MUST run before any HTML output, including before the `<html>` tag — this is a hard requirement (not a style preference) because cookies are transmitted as part of the HTTP header, which must be sent before the response body; this is the same constraint sessions have. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Cookie** — a small text file the server stores in the browser, resent with every subsequent HTTP request. [S1]
+- **`setcookie(name, value, expire, path, domain, secure, httponly)`** — only `name` is required; all others optional. [S1]
+- **Must precede any output** — `setcookie()` must be called before `<html>` or any other output, since cookies are part of the HTTP header. [S1]
+- **`$_COOKIE`** — superglobal for reading cookie values. [S1]
+- **Deleting a cookie** — call `setcookie()` again with an expiration time in the PAST. [S1]
+- **Auto URL-encoding** — cookie values are automatically URL-encoded on send and decoded on receipt (use `setrawcookie()` to opt out). [S1]
+
+## 📖 세부 내용 (Details)
+- Create + retrieve: `setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); ... if(isset($_COOKIE[$cookie_name])) { echo $_COOKIE[$cookie_name]; }`. [S1]
+- Modify: re-calling `setcookie()` with a new value overwrites the old one. [S1]
+- Delete: `setcookie("username", "", time() - 3600); // expiration in the past`. [S1]
+- Check if cookies enabled: `setcookie("test_cookie", "test", time() + 3600, '/'); ... if(count($_COOKIE) > 0) { echo "Cookies are enabled."; }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **출력 전 호출 필수**: setcookie()는 HTTP 헤더의 일부이므로 반드시 <html> 태그를 포함한 어떤 출력보다도 먼저 호출되어야 한다는 점이 두 번 강조됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 30일 만료 쿠키로 사용자 이름을 저장하는 것이 로그인 상태 유지의 대표 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Creating and checking a cookie (PHP):
+```php
+<?php
+$cookie_name = "username";
+$cookie_value = "John Doe";
+setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // must run before <html>
+?>
+<html>
+<body>
+<?php
+if (isset($_COOKIE[$cookie_name])) {
+    echo "Value is: " . $_COOKIE[$cookie_name];
+}
+?>
+</body>
+</html>
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.90
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[PHP Tutorial]]
+- **관련 개념:** [[PHP File Upload]], [[PHP Sessions]], [[PHP Superglobals]]
+- **참조 맥락:** 클라이언트 측 데이터 저장 — 세션(Sessions) 챕터로 직접 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP Cookies — https://www.w3schools.com/php/php_cookies.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Cookies" page (Astra wiki-curation, P-Reinforce v3.1 format).