docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동

최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: php-switch
+title: "PHP Switch"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["PHP 스위치문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "switch"]
+raw_sources: ["https://www.w3schools.com/php/php_switch.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP Switch]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Omitting `break` causes "fall-through" that runs the NEXT case's code too, regardless of whether it matches — the source's own example demonstrates this directly: removing `break` from the matched "red" case makes the "blue" case's code execute right after it, even though `$favcolor` is definitely not "blue". [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`switch(expression)`** — evaluates once, compares against each `case`. [S1]
+- **`break`** — required to stop fall-through into the next case; the LAST case doesn't strictly need it. [S1]
+- **Fall-through warning** — omitting break in a non-last case runs the next case's code unconditionally. [S1]
+- **`default`** — runs when no case matches. [S1]
+- **Combining cases** — stacking multiple `case` labels with no code between them shares one code block. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic switch: `switch ($favcolor) { case "red": echo "Your favorite color is red!"; break; case "blue": ...; default: ...; }`. [S1]
+- Fall-through demonstration: removing `break` from `case "red":` causes `case "blue":`'s code to also run even though favcolor is "red", not "blue". [S1]
+- Combined cases: `case 1: case 2: case 3: case 4: case 5: echo "The week feels so long!"; break; case 6: case 0: echo "Weekends are best!"; break;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **break 생략 시 폴스루(fall-through) 경고**: 마지막이 아닌 case에서 break를 생략하면 다음 case 코드가 매치 여부와 무관하게 실행된다는 점이 예제로 직접 증명됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 요일 그룹(평일/주말)을 case 결합으로 표현하는 것이 실전 활용의 대표 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Combining multiple case labels for shared logic (PHP):
+```php
+$d = 3;
+switch ($d) {
+    case 1:
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+        echo "The week feels so long!";
+        break;
+    case 6:
+    case 0:
+        echo "Weekends are best!";
+        break;
+    default:
+        echo "Something went wrong";
+}
+```
+
+## ✅ 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 If Nested]], [[PHP Match]], [[PHP Looping]]
+- **참조 맥락:** 다중 분기 구조 — Match 표현식(PHP 8) 챕터로 직접 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP switch Statement — https://www.w3schools.com/php/php_switch.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP switch Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).