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2nd/10_Wiki/Topics/Domain_Programming/Topic_PHP/PHP_Cookies.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-cookies PHP Cookies Programming_Language draft conceptual
setcookie()
$_COOKIE
PHP 쿠키
B 0.9 2026-07-04 2026-07-04
php
programming
w3schools
cookies
https://www.w3schools.com/php/php_cookies.asp

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 outputsetcookie() 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
$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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

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