2nd/10_Wiki/Dev/Topic_PHP/PHP_If_Else.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-else	PHP If Else	Programming_Language	draft	conceptual		if statement PHP 조건문		B	0.9	2026-07-04	2026-07-04			php programming w3schools conditions if	https://www.w3schools.com/php/php_if_else.asp

PHP If Else

🎯 한 줄 통찰 (One-line insight)

PHP names four distinct conditional statement forms upfront (if / if-else / if-elseif-else / switch) as one family, framing them as increasingly powerful tools for the same underlying task — selecting which code runs — rather than teaching if in isolation. [S1]

🧠 핵심 개념 (Core concepts)

• if (condition) { ... } — runs a code block only when the condition is true. [S1]
• Four conditional forms overview — if, if...else, if...elseif...else, switch — each handles a different number of branches. [S1]
• Braces required for blocks — the code to run sits inside { }. [S1]

📖 세부 내용 (Details)

• Literal comparison: if (5 > 3) { echo "Have a good day!"; }. [S1]
• Variable comparison: $t = 14; if ($t < 20) { echo "Have a good day!"; }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 조건문 4종 세트의 첫 단계로, 비교 연산자(If Operators) 챕터로 바로 확장된다. [S1]

💻 코드 패턴 (Code patterns)

Basic if with a variable condition (PHP):

$t = 14;
if ($t < 20) {
    echo "Have a good day!";
}

✅ 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 Operators, PHP If Operators, PHP If Else If, PHP Switch
• 참조 맥락: 조건문의 출발점 — 비교/논리 연산자(If Operators) 챕터로 직접 이어짐.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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