2nd/10_Wiki/Dev/Topic_PHP/PHP_Exceptions.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-exceptions	PHP Exceptions	Programming_Language	draft	conceptual		try catch finally Exception object PHP 예외		B	0.9	2026-07-04	2026-07-04			php programming w3schools exceptions try-catch	https://www.w3schools.com/php/php_exceptions.asp

PHP Exceptions

🎯 한 줄 통찰 (One-line insight)

An uncaught exception doesn't just print an error — it terminates the ENTIRE script, including any code AFTER the throwing line (echo 'Hello'; never runs in the uncaught example) — making exception handling not just about nice error messages but about whether the rest of the program executes at all. [S1]

🧠 핵심 개념 (Core concepts)

• Exception — an unwanted/unexpected event during script execution; thrown by many built-in functions/classes. [S1]
• throw — raises an exception. [S1]
• try — wraps code that might throw. [S1]
• catch(Exception $e) — handles a thrown exception; specifies the exception type and a variable name. [S1]
• finally — runs regardless of whether an exception was caught. [S1]
• new Exception(message, code, previous) — all three constructor parameters optional. [S1]
• Exception object methods — getMessage(), getPrevious(), getCode(), getFile(), getLine(). [S1]

📖 세부 내용 (Details)

• Uncaught exception halts everything after it: echo divide(5, 0); echo 'Hello'; — "Hello" never prints, since the fatal error terminates the script. [S1]
• Basic try/catch: try { echo divide(5, 0); } catch(Exception $e) { echo 'Error: ' . $e->getMessage(); }. [S1]
• try/catch/finally: adds finally { echo '<br>Process complete.'; } which runs no matter what. [S1]
• Full exception info: catch(Exception $e) { $file = $e->getFile(); $line = $e->getLine(); $code = $e->getCode(); $message = $e->getMessage(); echo "Exception thrown in $file on line $line: [Code $code] $message"; }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 미처리 예외의 전체 중단 효과: 예외가 처리되지 않으면 발생 지점 이후의 모든 코드가 실행되지 않고 스크립트 자체가 종료된다는 점이 예제로 직접 증명됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — divide() 함수의 0으로 나누기 방지가 예외 처리의 표준 교육용 예시다. [S1]

💻 코드 패턴 (Code patterns)

Try/catch/finally with full exception info (PHP):

function divide($x, $y) {
    if ($y == 0) {
        throw new Exception("Cannot divide by zero.");
    }
    return $x / $y;
}
try {
    echo divide(5, 0);
} catch (Exception $e) {
    echo "Exception in " . $e->getFile() . " on line " . $e->getLine() . ": " . $e->getMessage();
} finally {
    echo '<br>Process complete.';
}

✅ 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 JSON, PHP Error Handling, PHP Exception
• 참조 맥락: 예외 처리 기초(throw/try/catch/finally) — 에러 처리(Error Handling) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP Exceptions — https://www.w3schools.com/php/php_exceptions.asp

📝 변경 이력 (Change history)

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