2nd/10_Wiki/Dev/Topic_PHP/PHP_If_Nested.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-if-nested	PHP If Nested	Programming_Language	draft	conceptual		PHP 중첩 조건문		B	0.86	2026-07-04	2026-07-04			php programming w3schools conditions nested-if	https://www.w3schools.com/php/php_if_nested.asp

PHP If Nested

🎯 한 줄 통찰 (One-line insight)

The inner if/else in a nested-if structure only executes at all once the outer condition passes — the example's inner check ($a > 20) never even evaluates unless $a > 10 is already true, meaning the nested structure encodes "check this second thing, but only if the first thing already held." [S1]

🧠 핵심 개념 (Core concepts)

• Nested if — placing an if statement inside another if statement's block. [S1]
• Conditional evaluation — the inner if only runs when the outer condition is satisfied. [S1]

📖 세부 내용 (Details)

• Nested structure: $a = 13; if ($a > 10) { echo "Above 10"; if ($a > 20) { echo " and also above 20"; } else { echo " but not above 20"; } } — outputs "Above 10 but not above 20". [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 값이 특정 구간(10 초과, 20 초과)에 속하는지 단계적으로 검사하는 것이 중첩 조건문의 대표 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Nested if with inner else (PHP):

$a = 13;
if ($a > 10) {
    echo "Above 10";
    if ($a > 20) {
        echo " and also above 20";
    } else {
        echo " but not above 20";
    }
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.86
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: PHP Tutorial
• 관련 개념: PHP If Shorthand, PHP Switch
• 참조 맥락: 조건문 섹션의 마지막 단계형 — 스위치(Switch) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP Nested if Statements — https://www.w3schools.com/php/php_if_nested.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "PHP Nested if Statements" page (Astra wiki-curation, P-Reinforce v3.1 format).