2nd/10_Wiki/Topics/Domain_Programming/Topic_PHP/PHP_Match.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-match	PHP Match	Programming_Language	draft	conceptual		match expression PHP match		B	0.9	2026-07-04	2026-07-04			php programming w3schools match php8	https://www.w3schools.com/php/php_match.asp

PHP Match

🎯 한 줄 통찰 (One-line insight)

match (PHP 8.0+) uses STRICT comparison (===) internally while switch uses loose comparison (==) — this means match won't accidentally match a string "1" against an int 1 the way switch might, making match both safer and more predictable, on top of returning a value and auto-breaking after any match. [S1]

🧠 핵심 개념 (Core concepts)

• match (PHP 8.0+) — evaluates an expression against alternatives using strict (===) comparison, returns a value. [S1]
• Four key differences from switch — more readable syntax; returns a value (switch doesn't); auto-breaks after a match (switch needs explicit break); strict comparison (switch uses loose ==). [S1]
• Syntax — $result = match($expr) { cond1 => val1, cond2, cond3 => val2, default => defaultVal };. [S1]
• Multiple conditions per arm — comma-separated conditions sharing one result. [S1]
• UnhandledMatchError — thrown if no condition matches AND there's no default arm. [S1]

📖 세부 내용 (Details)

• Basic match (equivalent to the switch example): $favcolor = "red"; $text = match($favcolor) { "red" => "Your favorite color is red!", "blue" => "...", "green" => "...", default => "..." }; echo $text;. [S1]
• Multiple values per arm: $text = match($d) { 1, 2, 3, 4, 5 => "The week feels so long!", 6, 0 => "Weekends are best!", default => "Invalid day" };. [S1]
• No match, no default → exception: $favcolor = "pink"; try { $text = match($favcolor) { "red" => ..., "blue" => ..., "green" => ... }; } catch (\UnhandledMatchError $e) { var_dump($e); }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• match와 switch의 근본적 차이 4가지: 값 반환 여부, 자동 break 여부, 엄격 비교(===) vs 느슨한 비교(==)가 명확히 구분됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 값이 없을 때 UnhandledMatchError를 try-catch로 처리하는 패턴이 견고한 매치 로직의 실전 예시다. [S1]

💻 코드 패턴 (Code patterns)

Match expression with strict comparison and value return (PHP 8+):

$favcolor = "red";
$text = match($favcolor) {
    "red" => "Your favorite color is red!",
    "blue" => "Your favorite color is blue!",
    "green" => "Your favorite color is green!",
    default => "Your favorite color is neither red, blue, nor green!",
};
echo $text;

✅ 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 Switch, PHP Exceptions, PHP Looping
• 참조 맥락: switch의 PHP 8 대안 — 반복문(Looping) 섹션으로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP match Expression — https://www.w3schools.com/php/php_match.asp

📝 변경 이력 (Change history)

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