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83 lines
3.9 KiB
Markdown
83 lines
3.9 KiB
Markdown
---
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id: php-exceptions
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title: "PHP Exceptions"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["try catch finally", "Exception object", "PHP 예외"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["php", "programming", "w3schools", "exceptions", "try-catch"]
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raw_sources: ["https://www.w3schools.com/php/php_exceptions.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[PHP Exceptions]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Exception** — an unwanted/unexpected event during script execution; thrown by many built-in functions/classes. [S1]
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- **`throw`** — raises an exception. [S1]
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- **`try`** — wraps code that might throw. [S1]
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- **`catch(Exception $e)`** — handles a thrown exception; specifies the exception type and a variable name. [S1]
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- **`finally`** — runs regardless of whether an exception was caught. [S1]
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- **`new Exception(message, code, previous)`** — all three constructor parameters optional. [S1]
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- **Exception object methods** — `getMessage()`, `getPrevious()`, `getCode()`, `getFile()`, `getLine()`. [S1]
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## 📖 세부 내용 (Details)
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- Uncaught exception halts everything after it: `echo divide(5, 0); echo 'Hello';` — "Hello" never prints, since the fatal error terminates the script. [S1]
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- Basic try/catch: `try { echo divide(5, 0); } catch(Exception $e) { echo 'Error: ' . $e->getMessage(); }`. [S1]
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- try/catch/finally: adds `finally { echo '<br>Process complete.'; }` which runs no matter what. [S1]
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- 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] $message"; }`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **미처리 예외의 전체 중단 효과**: 예외가 처리되지 않으면 발생 지점 이후의 모든 코드가 실행되지 않고 스크립트 자체가 종료된다는 점이 예제로 직접 증명됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — divide() 함수의 0으로 나누기 방지가 예외 처리의 표준 교육용 예시다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Try/catch/finally with full exception info (PHP):
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```php
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function divide($x, $y) {
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if ($y == 0) {
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throw new Exception("Cannot divide by zero.");
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}
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return $x / $y;
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}
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try {
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echo divide(5, 0);
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} catch (Exception $e) {
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echo "Exception in " . $e->getFile() . " on line " . $e->getLine() . ": " . $e->getMessage();
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} finally {
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echo '<br>Process complete.';
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}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[PHP Tutorial]]
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- **관련 개념:** [[PHP JSON]], [[PHP Error Handling]], [[PHP Exception]]
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- **참조 맥락:** 예외 처리 기초(throw/try/catch/finally) — 에러 처리(Error Handling) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — PHP Exceptions — https://www.w3schools.com/php/php_exceptions.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Exceptions" page (Astra wiki-curation, P-Reinforce v3.1 format).
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