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title

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)

상위/루트: PHP Tutorial
관련 개념: PHP Constants, PHP Operators, PHP OOP Classes Objects
참조 맥락: 문맥 의존적 상수 — 연산자(Operators) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — PHP Magic Constants — https://www.w3schools.com/php/php_magic_constants.asp

📝 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).

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