---
id: php-exceptions
title: "PHP Exceptions"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["try catch finally", "Exception object", "PHP 예외"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["php", "programming", "w3schools", "exceptions", "try-catch"]
raw_sources: ["https://www.w3schools.com/php/php_exceptions.asp"]
applied_in: []
github_commit: ""
---

# [[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):
```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).