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3.6 KiB
3.6 KiB
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 |
|
B | 0.9 | 2026-07-04 | 2026-07-04 |
|
|
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).