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10_Wiki/Dev/Topic_PHP/PHP_Forms.md

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+---
+id: php-forms
+title: "PHP Forms"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["GET vs POST", "PHP 폼 처리"]
+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", "forms", "get", "post"]
+raw_sources: ["https://www.w3schools.com/php/php_forms.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP Forms]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+GET data is visible in the URL and bookmarkable, but capped at ~2000 characters and NEVER safe for passwords — while POST data is invisible in the URL (no bookmarking) but has no size limit and supports file uploads — meaning the "developer preference for POST" isn't arbitrary, it directly follows from these visibility/size/capability trade-offs. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`$_GET` / `$_POST`** — superglobal arrays collecting form data by the `name` attribute as key. [S1]
+- **GET** — data visible in URL; ~2000 character limit; bookmarkable; NEVER use for passwords/sensitive data. [S1]
+- **POST** — data invisible (embedded in request body); no size limit; supports file uploads (multi-part binary). [S1]
+- **No validation shown yet** — this chapter demonstrates the mechanics only; security/validation comes in later chapters. [S1]
+
+## 📖 세부 내용 (Details)
+- POST form: `<form action="welcome.php" method="post"> Name: <input type="text" name="name"><br> ...`. [S1]
+- Retrieval: `echo $_POST["name"]; echo $_POST["email"];`. [S1]
+- GET form equivalent: `<form action="welcome_get.php" method="get"> ...` retrieved via `$_GET["name"]`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **GET의 보안 경고**: 비밀번호 등 민감한 정보는 절대 GET으로 전송해서는 안 된다는 점이 강하게 경고됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 이 챕터의 예제는 검증 없는 기초 폼 처리이며, 다음 챕터부터 보안을 고려한 검증이 다뤄진다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Basic POST form and retrieval (PHP/HTML):
+```html
+<form action="welcome.php" method="post">
+    Name: <input type="text" name="name"><br>
+    <input type="submit">
+</form>
+```
+```php
+echo $_POST["name"];
+```
+
+## ✅ 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 Superglobals Get]], [[PHP Superglobals Post]], [[PHP Form Validation]]
+- **참조 맥락:** 폼 처리의 기초 — 보안을 고려한 폼 검증(Form Validation) 챕터로 직접 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP Form Handling — https://www.w3schools.com/php/php_forms.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Form Handling" page (Astra wiki-curation, P-Reinforce v3.1 format).