docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

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.
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+---
+id: php-string-escape
+title: "PHP String Escape"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["escape characters", "PHP 이스케이프 문자"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "strings", "escape"]
+raw_sources: ["https://www.w3schools.com/php/php_string_escape.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP String Escape]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+PHP has an escape sequence specifically for the `$` sign (`\$`) — a character other languages rarely need to escape — because `$` triggers variable interpolation inside double-quoted strings, so writing a literal dollar sign next to what could be mistaken for a variable name requires this PHP-specific escape. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Escape character** — a backslash `\` followed by the character to insert literally. [S1]
+- **Why needed** — inserting characters that would otherwise be interpreted specially (e.g., a `"` inside a double-quoted string). [S1]
+- **Escape table** — `\'` (single quote), `\"` (double quote), `\$` (literal PHP variable sigil), `\n` (newline), `\r` (carriage return), `\t` (tab), `\f` (form feed), `\ooo` (octal), `\xhh` (hex). [S1]
+
+## 📖 세부 내용 (Details)
+- Problem: `$x = "We are the so-called "Vikings" from the north."; // illegal — breaks the string`. [S1]
+- Fix: `$x = "We are the so-called \"Vikings\" from the north."; echo $x;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 큰따옴표 문자열 안에 인용구를 포함해야 할 때 \"로 이스케이프하는 것이 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Escaping double quotes inside a double-quoted string (PHP):
+```php
+$x = "We are the so-called \"Vikings\" from the north.";
+echo $x;
+```
+
+## ✅ 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 Strings]], [[PHP String Slicing]], [[PHP Numbers]]
+- **참조 맥락:** 문자열 섹션의 마지막 — 숫자(Numbers) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP - Escape Characters — https://www.w3schools.com/php/php_string_escape.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP - Escape Characters" page (Astra wiki-curation, P-Reinforce v3.1 format).