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Antigravity Agent e9cbf23ab5 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.

2026-07-05 00:39:13 +09:00

3.6 KiB

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title

PHP Sessions

🎯 한 줄 통찰 (One-line insight)

A session's ONLY client-side footprint is a small random ID stored in a PHPSESSID cookie — the actual session DATA lives entirely on the server (typically in a temp file), meaning sessions are fundamentally more secure than cookies for sensitive data, since the browser never holds the real information, just a lookup key. [S1]

🧠 핵심 개념 (Core concepts)

Session — solves HTTP's statelessness by storing per-user data server-side, linked via a client-side ID cookie. [S1]
session_start() — must be called at the very beginning of every script using sessions, before ANY HTML output or whitespace. [S1]
$_SESSION — superglobal for storing/accessing session variables. [S1]
unset($_SESSION["key"]) — removes one session variable. [S1]
session_unset() — clears ALL session variables. [S1]
session_destroy() — destroys all data tied to the current session entirely. [S1]
Default lifetime — session data persists until the browser closes (unlike cookies, which can have a long fixed expiration). [S1]
Sessions vs. cookies — sessions: server-stored, more secure, closes-on-browser-close, more efficient (no repeated data transfer); cookies: browser-stored, less secure, long expiration possible, less efficient (sent with every request). [S1]

📖 세부 내용 (Details)

Start + set variables: session_start(); $_SESSION["favcolor"] = "green"; $_SESSION["favanimal"] = "cat";. [S1]
Retrieve on another page: session_start(); if(isset($_SESSION["favcolor"])) { echo $_SESSION["favcolor"]; }. [S1]
Modify: overwrite directly — $_SESSION["favcolor"] = "yellow";. [S1]
Destroy (logout): session_start(); session_unset(); session_destroy(); echo "You have been logged out.";. [S1]
Debug all values: print_r($_SESSION);. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — session_unset()+session_destroy() 조합으로 로그아웃을 구현하는 것이 실전 인증 시스템의 표준 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Logging out by clearing all session data (PHP):

session_start();
session_unset();
session_destroy();
echo "You have been logged out.";

✅ 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 Cookies, PHP Filter
참조 맥락: 서버 측 사용자 데이터 저장 — 필터(Filter) 섹션으로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — PHP Sessions — https://www.w3schools.com/php/php_sessions.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "PHP Sessions" page (Astra wiki-curation, P-Reinforce v3.1 format).

3.6 KiB Raw Blame History