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3.1 KiB
3.1 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-oop-constants | PHP OOP Constants | Programming_Language | draft | conceptual |
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B | 0.89 | 2026-07-04 | 2026-07-04 |
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PHP OOP Constants
🎯 한 줄 통찰 (One-line insight)
Class constants use TWO different keywords depending on whether you're inside or outside the class — ClassName::CONSTANT from outside, but self::CONSTANT from inside a method — even though both use the same :: scope resolution operator, meaning the class-name vs. self choice signals your calling context. [S1]
🧠 핵심 개념 (Core concepts)
- Class constant — declared with
const; fixed value, cannot change once set; default visibility ispublic. [S1] - Case-sensitive but conventionally uppercase — best practice names constants in ALL_CAPS. [S1]
- Access from outside —
ClassName::CONSTANT_NAME. [S1] - Access from inside —
self::CONSTANT_NAME. [S1]
📖 세부 내용 (Details)
- Outside access:
class Goodbye { const MESSAGE = "Thank you for visiting W3Schools.com!"; } echo Goodbye::MESSAGE;. [S1] - Inside access (self):
class Goodbye { const MESSAGE = "..."; public function bye() { echo self::MESSAGE; } } $goodbye = new Goodbye(); $goodbye->bye();. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 클래스 상수는 정적 메서드/속성 챕터에서 사용하는 :: 연산자를 먼저 익히는 단계다. [S1]
💻 코드 패턴 (Code patterns)
Accessing a class constant from inside via self:: (PHP):
class Goodbye {
const MESSAGE = "Thank you for visiting W3Schools.com!";
public function bye() {
echo self::MESSAGE;
}
}
✅ 검증 상태 및 신뢰도
- 상태: draft
- 검증 단계: conceptual
- 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
- 신뢰 점수: 0.89
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: PHP Tutorial
- 관련 개념: PHP OOP Inheritance, PHP OOP Classes Abstract, PHP OOP Static Properties
- 참조 맥락: :: 연산자를 이용한 클래스 상수 접근 — 추상 클래스(Abstract Classes) 챕터로 이어짐.
📚 출처 (Sources)
- [S1] W3Schools — PHP OOP - Class Constants — https://www.w3schools.com/php/php_oop_constants.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP OOP Class Constants" page (Astra wiki-curation, P-Reinforce v3.1 format).