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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
php-oop-constants PHP OOP Constants Programming_Language draft conceptual
class constants
scope resolution operator
PHP 클래스 상수
B 0.89 2026-07-04 2026-07-04
php
programming
w3schools
oop
constants
https://www.w3schools.com/php/php_oop_constants.asp

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 is public. [S1]
  • Case-sensitive but conventionally uppercase — best practice names constants in ALL_CAPS. [S1]
  • Access from outsideClassName::CONSTANT_NAME. [S1]
  • Access from insideself::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)

📚 출처 (Sources)

📝 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).