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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
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-magic-constants PHP Magic Constants Programming_Language draft conceptual
__LINE__
__FILE__
PHP 매직 상수
B 0.88 2026-07-04 2026-07-04
php
programming
w3schools
magic-constants
https://www.w3schools.com/php/php_magic_constants.asp

PHP Magic Constants

🎯 한 줄 통찰 (One-line insight)

Magic constants are the opposite of normal constants — instead of holding a fixed value defined once, each one dynamically CHANGES based on where in the code it's evaluated (__LINE__ differs on every line, __FUNCTION__ differs per function), making them contextual metadata rather than stored values. [S1]

🧠 핵심 개념 (Core concepts)

  • Magic constants — 9 predefined constants whose value depends on where they're used, providing script-state info (file, line, class, function, namespace). [S1]
  • Naming convention — start and end with double underscores __, except ClassName::class. [S1]
  • Not case-sensitive__LINE__ and __line__ are equivalent. [S1]
  • The 9 constants__CLASS__, __DIR__, __FILE__, __FUNCTION__, __LINE__, __METHOD__, __NAMESPACE__, __TRAIT__, ClassName::class. [S1]

📖 세부 내용 (Details)

  • __CLASS__ — class name if used inside a class. [S1]
  • __DIR__ — directory of the current file. [S1]
  • __FILE__ — full path + filename. [S1]
  • __FUNCTION__ — current function name. [S1]
  • __LINE__ — current line number. [S1]
  • __METHOD__ — class name + function name combined. [S1]
  • __NAMESPACE__ — current namespace name. [S1]
  • __TRAIT__ — current trait name. [S1]
  • ClassName::class — fully qualified class name including namespace. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — LINE/__FILE__은 디버깅/로깅 시 에러 위치를 정확히 기록하는 데 자주 쓰인다. [S1]

💻 코드 패턴 (Code patterns)

Magic constants reflect their context (PHP):

echo __LINE__;      // current line number
echo __FILE__;      // full path of this file
echo __FUNCTION__;  // name of the enclosing function

검증 상태 및 신뢰도

  • 상태: draft
  • 검증 단계: conceptual
  • 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
  • 신뢰 점수: 0.88
  • 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 Magic Constants" page (Astra wiki-curation, P-Reinforce v3.1 format).