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Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
76 lines
3.6 KiB
Markdown
76 lines
3.6 KiB
Markdown
---
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id: php-sessions
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title: "PHP Sessions"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["session_start()", "$_SESSION", "PHP 세션"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["php", "programming", "w3schools", "sessions"]
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raw_sources: ["https://www.w3schools.com/php/php_sessions.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[PHP Sessions]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Session** — solves HTTP's statelessness by storing per-user data server-side, linked via a client-side ID cookie. [S1]
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- **`session_start()`** — must be called at the very beginning of every script using sessions, before ANY HTML output or whitespace. [S1]
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- **`$_SESSION`** — superglobal for storing/accessing session variables. [S1]
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- **`unset($_SESSION["key"])`** — removes one session variable. [S1]
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- **`session_unset()`** — clears ALL session variables. [S1]
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- **`session_destroy()`** — destroys all data tied to the current session entirely. [S1]
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- **Default lifetime** — session data persists until the browser closes (unlike cookies, which can have a long fixed expiration). [S1]
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- **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]
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## 📖 세부 내용 (Details)
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- Start + set variables: `session_start(); $_SESSION["favcolor"] = "green"; $_SESSION["favanimal"] = "cat";`. [S1]
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- Retrieve on another page: `session_start(); if(isset($_SESSION["favcolor"])) { echo $_SESSION["favcolor"]; }`. [S1]
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- Modify: overwrite directly — `$_SESSION["favcolor"] = "yellow";`. [S1]
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- Destroy (logout): `session_start(); session_unset(); session_destroy(); echo "You have been logged out.";`. [S1]
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- Debug all values: `print_r($_SESSION);`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — session_unset()+session_destroy() 조합으로 로그아웃을 구현하는 것이 실전 인증 시스템의 표준 패턴이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Logging out by clearing all session data (PHP):
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```php
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session_start();
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session_unset();
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session_destroy();
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echo "You have been logged out.";
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[PHP Tutorial]]
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- **관련 개념:** [[PHP Cookies]], [[PHP Filter]]
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- **참조 맥락:** 서버 측 사용자 데이터 저장 — 필터(Filter) 섹션으로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — PHP Sessions — https://www.w3schools.com/php/php_sessions.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Sessions" page (Astra wiki-curation, P-Reinforce v3.1 format).
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