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83 lines
3.4 KiB
Markdown
83 lines
3.4 KiB
Markdown
---
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id: php-switch
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title: "PHP Switch"
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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: ["PHP 스위치문"]
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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", "switch"]
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raw_sources: ["https://www.w3schools.com/php/php_switch.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[PHP Switch]]
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## 🎯 한 줄 통찰 (One-line insight)
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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 `$favcolor` is definitely not "blue". [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`switch(expression)`** — evaluates once, compares against each `case`. [S1]
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- **`break`** — required to stop fall-through into the next case; the LAST case doesn't strictly need it. [S1]
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- **Fall-through warning** — omitting break in a non-last case runs the next case's code unconditionally. [S1]
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- **`default`** — runs when no case matches. [S1]
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- **Combining cases** — stacking multiple `case` labels with no code between them shares one code block. [S1]
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## 📖 세부 내용 (Details)
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- Basic switch: `switch ($favcolor) { case "red": echo "Your favorite color is red!"; break; case "blue": ...; default: ...; }`. [S1]
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- Fall-through demonstration: removing `break` from `case "red":` causes `case "blue":`'s code to also run even though favcolor is "red", not "blue". [S1]
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- 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]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **break 생략 시 폴스루(fall-through) 경고**: 마지막이 아닌 case에서 break를 생략하면 다음 case 코드가 매치 여부와 무관하게 실행된다는 점이 예제로 직접 증명됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 요일 그룹(평일/주말)을 case 결합으로 표현하는 것이 실전 활용의 대표 패턴이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Combining multiple case labels for shared logic (PHP):
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```php
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$d = 3;
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switch ($d) {
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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echo "The week feels so long!";
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break;
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case 6:
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case 0:
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echo "Weekends are best!";
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break;
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default:
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echo "Something went wrong";
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}
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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 If Nested]], [[PHP Match]], [[PHP Looping]]
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- **참조 맥락:** 다중 분기 구조 — Match 표현식(PHP 8) 챕터로 직접 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — PHP switch Statement — https://www.w3schools.com/php/php_switch.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "PHP switch Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).
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