e9cbf23ab5
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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-variables | PHP Variables | Programming_Language | draft | conceptual |
|
B | 0.9 | 2026-07-04 | 2026-07-04 |
|
|
PHP Variables
🎯 한 줄 통찰 (One-line insight)
PHP has NO variable declaration command — a variable is created the instant you assign it a value ($x = 5;), unlike statically-declared languages; this is the source's explicit framing of what makes PHP "loosely typed" from the very first line of variable usage. [S1]
🧠 핵심 개념 (Core concepts)
$prefix — every variable name starts with$. [S1]- Naming rules — starts with a letter or underscore (never a number); alphanumeric + underscore only; case-sensitive. [S1]
- No declaration keyword — a variable springs into existence at first assignment. [S1]
- Loosely typed — PHP infers the data type from the assigned value; no explicit type annotation needed. [S1]
var_dump()— reveals both the data type and value of a variable. [S1]- Multiple assignment —
$x = $y = $z = "Fruit";assigns the same value to several variables in one statement. [S1] - Supported data types — string, int, float, bool, array, object, null, resource, mixed. [S1]
📖 세부 내용 (Details)
- Basic assignment:
$x = 5; $y = "John";. [S1] - Output with interpolation:
$txt = "W3Schools.com"; echo "I love $txt!";— equivalent toecho 'I love ' . $txt . '!';. [S1] - Type inspection:
var_dump(5); var_dump("John"); var_dump(3.14); var_dump(true); var_dump([2, 3, 56]); var_dump(NULL);. [S1] - Multi-assignment:
$x = $y = $z = "Fruit";. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — var_dump()로 변수의 실제 타입과 값을 확인하는 것이 디버깅의 표준 도구다. [S1]
💻 코드 패턴 (Code patterns)
Multi-variable assignment in one line (PHP):
$x = $y = $z = "Fruit";
✅ 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 Variables Scope, PHP Echo Print, PHP Data Types
- 참조 맥락: 변수 기초 문법 — 스코프(Scope)/데이터 타입 챕터로 확장.
📚 출처 (Sources)
- [S1] W3Schools — PHP Variables — https://www.w3schools.com/php/php_variables.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Variables" page (Astra wiki-curation, P-Reinforce v3.1 format).