---
id: php-form-complete
title: "PHP Form Complete"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["sticky forms", "PHP 폼 완성 예제"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["php", "programming", "w3schools", "forms", "validation"]
raw_sources: ["https://www.w3schools.com/php/php_form_complete.asp"]
applied_in: []
github_commit: ""
---

# [[PHP Form Complete]]

## 🎯 한 줄 통찰 (One-line insight)
Radio buttons are "re-checked" differently from text fields after submission — text inputs echo into the `value` attribute (`value="<?php echo $name;?>"`), but radio buttons instead conditionally echo the literal word `"checked"` into the tag based on which value matches, since a radio's persisted state is a boolean attribute, not a value string. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Sticky form pattern** — preserving submitted values in the form after validation errors, so the user doesn't have to re-type everything. [S1]
- **Text inputs** — echo the variable into the `value` attribute. [S1]
- **Textarea** — echo the variable BETWEEN the opening/closing tags (no `value` attribute exists for textarea). [S1]
- **Radio buttons** — conditionally echo the literal string `"checked"` based on an `isset()` + equality check against the submitted gender. [S1]

## 📖 세부 내용 (Details)
- Text input sticky value: `<input type="text" name="name" value="<?php echo $name;?>">`. [S1]
- Textarea sticky value: `<textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>`. [S1]
- Radio button sticky check: `<input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 검증 실패 후에도 입력값을 유지하는 sticky form 패턴이 사용자 경험 개선의 실전 사례다. [S1]

## 💻 코드 패턴 (Code patterns)
Preserving a radio button's checked state after submission (PHP):
```php
<input type="radio" name="gender"
    <?php if (isset($gender) && $gender=="female") echo "checked";?>
    value="female">Female
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[PHP Tutorial]]
- **관련 개념:** [[PHP Form URL Email]], [[PHP Date]]
- **참조 맥락:** 폼 검증 섹션의 마무리 — 날짜(Date) 섹션으로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — PHP Complete Form Example — https://www.w3schools.com/php/php_form_complete.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Complete Form Example" page (Astra wiki-curation, P-Reinforce v3.1 format).