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71 lines
3.1 KiB
Markdown
71 lines
3.1 KiB
Markdown
---
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id: php-variables
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title: "PHP Variables"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["PHP 변수"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["php", "programming", "w3schools", "variables"]
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raw_sources: ["https://www.w3schools.com/php/php_variables.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[PHP Variables]]
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## 🎯 한 줄 통찰 (One-line insight)
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PHP has NO variable declaration command — a variable is created the instant you assign it a value (`$x = 5;`), unlike statically-declared languages; this is the source's explicit framing of what makes PHP "loosely typed" from the very first line of variable usage. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`$` prefix** — every variable name starts with `$`. [S1]
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- **Naming rules** — starts with a letter or underscore (never a number); alphanumeric + underscore only; case-sensitive. [S1]
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- **No declaration keyword** — a variable springs into existence at first assignment. [S1]
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- **Loosely typed** — PHP infers the data type from the assigned value; no explicit type annotation needed. [S1]
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- **`var_dump()`** — reveals both the data type and value of a variable. [S1]
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- **Multiple assignment** — `$x = $y = $z = "Fruit";` assigns the same value to several variables in one statement. [S1]
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- **Supported data types** — string, int, float, bool, array, object, null, resource, mixed. [S1]
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## 📖 세부 내용 (Details)
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- Basic assignment: `$x = 5; $y = "John";`. [S1]
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- Output with interpolation: `$txt = "W3Schools.com"; echo "I love $txt!";` — equivalent to `echo 'I love ' . $txt . '!';`. [S1]
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- Type inspection: `var_dump(5); var_dump("John"); var_dump(3.14); var_dump(true); var_dump([2, 3, 56]); var_dump(NULL);`. [S1]
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- Multi-assignment: `$x = $y = $z = "Fruit";`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — var_dump()로 변수의 실제 타입과 값을 확인하는 것이 디버깅의 표준 도구다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Multi-variable assignment in one line (PHP):
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```php
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$x = $y = $z = "Fruit";
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[PHP Tutorial]]
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- **관련 개념:** [[PHP Variables Scope]], [[PHP Echo Print]], [[PHP Data Types]]
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- **참조 맥락:** 변수 기초 문법 — 스코프(Scope)/데이터 타입 챕터로 확장.
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## 📚 출처 (Sources)
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- [S1] W3Schools — PHP Variables — https://www.w3schools.com/php/php_variables.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Variables" page (Astra wiki-curation, P-Reinforce v3.1 format).
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