2nd/10_Wiki/Dev/Topic_PHP/PHP_Looping_Do_While.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
php-looping-do-while	PHP Looping Do While	Programming_Language	draft	conceptual		do while loop PHP do-while 반복문		B	0.9	2026-07-04	2026-07-04			php programming w3schools loops do-while	https://www.w3schools.com/php/php_looping_do_while.asp

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):

$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).