refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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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).