---
id: php-arrays-indexed
title: "PHP Arrays Indexed"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["indexed arrays", "PHP 인덱스 배열"]
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", "arrays", "indexed"]
raw_sources: ["https://www.w3schools.com/php/php_arrays_indexed.asp"]
applied_in: []
github_commit: ""
---

# [[PHP Arrays Indexed]]

## 🎯 한 줄 통찰 (One-line insight)
Indexed arrays follow the universal 0-based convention (first item = index 0), and modifying an item just requires reassigning `$array[index] = newValue` — the same bracket syntax used for reading doubles as the syntax for writing, with no separate "setter" method needed. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Indexed array** — each item has a numeric index, starting at 0. [S1]
- **Access by index** — `$cars[0]` reads the first item. [S1]
- **Update by index** — `$cars[1] = "Ford";` overwrites the second item. [S1]
- **`foreach`** — the standard way to loop through all values. [S1]

## 📖 세부 내용 (Details)
- Create + inspect: `$cars = array("Volvo", "BMW", "Toyota"); var_dump($cars);`. [S1]
- Access: `echo $cars[0]; // "Volvo"`. [S1]
- Update: `$cars[1] = "Ford"; var_dump($cars);`. [S1]
- Loop: `foreach ($cars as $x) { echo "$x <br>"; }`. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — foreach로 인덱스 배열 전체를 순회 출력하는 것이 가장 기본적인 실전 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Updating an item by index, then looping (PHP):
```php
$cars = array("Volvo", "BMW", "Toyota");
$cars[1] = "Ford";
foreach ($cars as $x) {
    echo "$x <br>";
}
```

## ✅ 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 Arrays]], [[PHP Arrays Associative]], [[PHP Looping Foreach]]
- **참조 맥락:** 숫자 인덱스 배열의 기초 — 연관 배열(Associative) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — PHP Indexed Arrays — https://www.w3schools.com/php/php_arrays_indexed.asp

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