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3.4 KiB
3.4 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-switch | PHP Switch | Programming_Language | draft | conceptual |
|
B | 0.9 | 2026-07-04 | 2026-07-04 |
|
|
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 $favcolor is definitely not "blue". [S1]
🧠 핵심 개념 (Core concepts)
switch(expression)— evaluates once, compares against eachcase. [S1]break— required to stop fall-through into the next case; the LAST case doesn't strictly need it. [S1]- Fall-through warning — omitting break in a non-last case runs the next case's code unconditionally. [S1]
default— runs when no case matches. [S1]- Combining cases — stacking multiple
caselabels with no code between them shares one code block. [S1]
📖 세부 내용 (Details)
- Basic switch:
switch ($favcolor) { case "red": echo "Your favorite color is red!"; break; case "blue": ...; default: ...; }. [S1] - Fall-through demonstration: removing
breakfromcase "red":causescase "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):
$d = 3;
switch ($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).