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2nd/10_Wiki/Topics/Domain_Programming/Topic_PHP/PHP_Sessions.md
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Antigravity Agent c24165b8bc 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>
2026-07-11 11:05:56 +09:00

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id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
php-sessions PHP Sessions Programming_Language draft conceptual
session_start()
$_SESSION
PHP 세션
B 0.9 2026-07-04 2026-07-04
php
programming
w3schools
sessions
https://www.w3schools.com/php/php_sessions.asp

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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

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