docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화

Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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+---
+id: php-file-create
+title: "PHP File Create"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["fwrite()", "append mode", "PHP 파일 생성/쓰기"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "files", "fwrite"]
+raw_sources: ["https://www.w3schools.com/php/php_file_create.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP File Create]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+PHP uses the SAME function (`fopen()`) to both open AND create files — passing `"w"` or `"a"` mode on a non-existent filename silently creates it, meaning there's no separate "create file" function; opening a file for writing IS how you create one. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`fopen($name, "w")` on a nonexistent file** — creates it. [S1]
+- **`fwrite($file, $string)`** — writes a string to an open file. [S1]
+- **`"w"` mode overwrites** — opening an EXISTING file in `"w"` mode ERASES all its content before writing new data. [S1]
+- **`"a"` mode appends** — preserves existing content, adds new data at the end. [S1]
+- **File permissions** — PHP must have write access to the target directory, or `fopen`/`fwrite` will fail. [S1]
+
+## 📖 세부 내용 (Details)
+- Create a new file: `$myfile = fopen("testfile.txt", "w")`. [S1]
+- Write multiple lines: `$myfile = fopen("newfile.txt", "w") or die("Unable to open file!"); fwrite($myfile, "John Doe\n"); fwrite($myfile, "Jane Doe\n"); fclose($myfile);`. [S1]
+- Overwrite demonstration: opening the same "newfile.txt" again with `"w"` and writing different names ERASES "John Doe"/"Jane Doe" entirely, leaving only the new content. [S1]
+- Append demonstration: opening with `"a"` and writing adds new lines AFTER the existing content, without erasing anything. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **w 모드의 파괴적 동작**: 기존 파일을 "w" 모드로 열면 기존 데이터가 전부 삭제된다는 점이 이전/이후 내용 비교 예제로 직접 증명됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 로그 파일에 새 항목을 추가할 때 "a" 모드를 사용하는 것이 append 모드의 대표 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Append mode preserves existing content (PHP):
+```php
+$myfile = fopen("newfile.txt", "a") or die("Unable to open file!");
+fwrite($myfile, "Donald Duck\n");
+fwrite($myfile, "Goofy Goof\n");
+fclose($myfile);
+// existing content is preserved; new lines added at the end
+```
+
+## ✅ 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 File Open]], [[PHP File Upload]]
+- **참조 맥락:** 파일 쓰기/덮어쓰기/추가 — 파일 업로드(File Upload) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP File Create/Write — https://www.w3schools.com/php/php_file_create.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP File Create/Write" page (Astra wiki-curation, P-Reinforce v3.1 format).