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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-variables PHP Variables Programming_Language draft conceptual
PHP 변수
B 0.9 2026-07-04 2026-07-04
php
programming
w3schools
variables
https://www.w3schools.com/php/php_variables.asp

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 to echo '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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "PHP Variables" page (Astra wiki-curation, P-Reinforce v3.1 format).