---
id: php-looping-do-while
title: "PHP Looping Do While"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["do while loop", "PHP do-while 반복문"]
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", "loops", "do-while"]
raw_sources: ["https://www.w3schools.com/php/php_looping_do_while.asp"]
applied_in: []
github_commit: ""
---

# [[PHP Looping Do While]]

## 🎯 한 줄 통찰 (One-line insight)
The source deliberately shows the SAME do...while loop run twice — once with `$i = 1` (condition true from the start) and once with `$i = 8` (condition false from the start) — to prove the loop still executes once in both cases, since the condition is checked AFTER the body runs, not before. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`do { ... } while (condition);`** — the condition is tested AFTER the code runs, guaranteeing at least one execution. [S1]
- **`break`** / **`continue`** — work the same as in while loops. [S1]

## 📖 세부 내용 (Details)
- Condition true from start: `$i = 1; do { echo $i; $i++; } while ($i < 6);` — runs normally. [S1]
- Condition false from start (still runs once): `$i = 8; do { echo $i; $i++; } while ($i < 6);` — prints 8, then stops (condition already false). [S1]
- Break: `$i = 1; do { if ($i == 3) break; echo $i; $i++; } while ($i < 6);`. [S1]
- Continue: `$i = 0; do { $i++; if ($i == 3) continue; echo $i; } while ($i < 6);`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **최소 1회 실행 보장**: $i=8로 시작해 조건이 처음부터 거짓이어도 do...while은 최소 한 번은 실행된다는 점이 두 가지 예제 비교로 증명됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 조건이 거짓이어도 최소 1회 실행이 필요한 상황(메뉴 표시 등)에 사용된다. [S1]

## 💻 코드 패턴 (Code patterns)
Do-while runs once even with a false-from-start condition (PHP):
```php
$i = 8;
do {
    echo $i;  // prints 8
    $i++;
} while ($i < 6); // condition already false, but body already ran once
```

## ✅ 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 Looping While]], [[PHP Looping For]]
- **참조 맥락:** while 루프와의 실행 시점 차이 — for 루프 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — PHP do while Loop — https://www.w3schools.com/php/php_looping_do_while.asp

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