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72 lines
3.1 KiB
Markdown
72 lines
3.1 KiB
Markdown
---
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id: php-syntax
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title: "PHP Syntax"
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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 기본 문법"]
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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", "syntax"]
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raw_sources: ["https://www.w3schools.com/php/php_syntax.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[PHP Syntax]]
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## 🎯 한 줄 통찰 (One-line insight)
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PHP's case-sensitivity is asymmetric — keywords/functions/classes are case-INsensitive (`ECHO` works same as `echo`), but variable names are strictly case-SENSITIVE (`$color` and `$COLOR` are two completely different variables), a distinction the source demonstrates directly by showing the second echo silently printing nothing meaningful. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **PHP tags** — a script starts with `<?php` and ends with `?>`. [S1]
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- **`.php` extension** — default file extension; files mix HTML and PHP code freely. [S1]
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- **Semicolons required** — all PHP statements end with `;`. [S1]
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- **Case-insensitive**: keywords, function names, class names, user-defined functions. [S1]
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- **Case-sensitive**: variable names. [S1]
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## 📖 세부 내용 (Details)
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- Basic script structure: `<?php echo 'Hello World!'; ?>` embedded inside HTML. [S1]
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- Keyword case-insensitivity: `ECHO 'Hello World!<br>'; echo 'Hello World!<br>';` — both legal and equivalent. [S1]
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- Variable case-sensitivity: `$color = "red"; echo "My car is $color<br>"; echo "My house is $COLOR";` — `$COLOR` is undefined/different from `$color`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **대소문자 구분의 비대칭성**: 키워드/함수/클래스는 대소문자 구분 없음, 하지만 변수명은 대소문자 구분됨이 명시적으로 대비됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — HTML과 PHP 코드를 한 파일에서 혼합하는 것이 PHP 스크립트의 기본 작성 방식이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Variable name case-sensitivity trap (PHP):
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```php
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<?php
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$color = "red";
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echo "My car is $color<br>"; // red
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echo "My house is $COLOR"; // undefined — $COLOR != $color
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?>
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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 Install]], [[PHP Comments]], [[PHP Variables]]
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- **참조 맥락:** PHP 기본 문법 — 주석(Comments), 변수(Variables) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — PHP Syntax — https://www.w3schools.com/php/php_syntax.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Syntax" page (Astra wiki-curation, P-Reinforce v3.1 format).
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