---
id: php-if-else-if
title: "PHP If Else If"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["elseif", "PHP if-else-if"]
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", "conditions", "elseif"]
raw_sources: ["https://www.w3schools.com/php/php_if_else_if.asp"]
applied_in: []
github_commit: ""
---

# [[PHP If Else If]]

## 🎯 한 줄 통찰 (One-line insight)
PHP's time-of-day example uses `date("H")` returning a STRING that's then compared against string literals like `"20"` and `"10"` — the comparisons `$t < "20"` still work correctly via PHP's loose typing (numeric string comparison), showing PHP doesn't require explicit numeric conversion for this common pattern. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`if...else`** — two-branch conditional: true-block vs. false-block. [S1]
- **`if...elseif...else`** — multi-branch conditional: multiple sequential conditions plus a catch-all `else`. [S1]
- **`elseif`** — single keyword (not `else if`) in PHP syntax. [S1]

## 📖 세부 내용 (Details)
- if...else: `$t = date("H"); if ($t < "20") { echo "Have a good day!"; } else { echo "Have a good night!"; }`. [S1]
- if...elseif...else: `if ($t < "10") { echo "Have a good morning!"; } elseif ($t < "20") { echo "Have a good day!"; } else { echo "Have a good night!"; }`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 시간대별 인사말(아침/낮/밤) 분기가 elseif 체인의 대표적 실전 예시다. [S1]

## 💻 코드 패턴 (Code patterns)
Three-way time-of-day branch with elseif (PHP):
```php
$t = date("H");
if ($t < "10") {
    echo "Have a good morning!";
} elseif ($t < "20") {
    echo "Have a good day!";
} else {
    echo "Have a good night!";
}
```

## ✅ 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 If Operators]], [[PHP If Shorthand]], [[PHP Date]]
- **참조 맥락:** 다중 분기 조건문 — 축약형(Shorthand If) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — PHP if...else Statements — https://www.w3schools.com/php/php_if_else_if.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP if...else Statements" page (Astra wiki-curation, P-Reinforce v3.1 format).