---
id: php-superglobals-server
title: "PHP Superglobals Server"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["$_SERVER", "PHP 서버 슈퍼글로벌"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["php", "programming", "w3schools", "superglobals", "server"]
raw_sources: ["https://www.w3schools.com/php/php_superglobals_server.asp"]
applied_in: []
github_commit: ""
---

# [[PHP Superglobals Server]]

## 🎯 한 줄 통찰 (One-line insight)
`$_SERVER` entries are NOT guaranteed to exist on every server/environment — the source explicitly warns these values are populated by the web server itself, so code relying on a specific `$_SERVER` key must handle its potential absence rather than assuming universal availability. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`$_SERVER`** — holds info about the web server: headers, paths, script locations. [S1]
- **Not universally guaranteed** — entries are created by the web server, so availability varies across environments. [S1]
- **Common elements** — `PHP_SELF` (current script filename), `SERVER_NAME`, `HTTP_HOST`, `HTTP_REFERER`, `HTTP_USER_AGENT`, `SCRIPT_NAME`, `REQUEST_METHOD`, `REMOTE_ADDR`, and many more. [S1]

## 📖 세부 내용 (Details)
- Common usage: `echo $_SERVER['PHP_SELF']; echo $_SERVER['SERVER_NAME']; echo $_SERVER['HTTP_HOST']; echo $_SERVER['HTTP_USER_AGENT'];`. [S1]
- Notable elements: `REQUEST_METHOD` (e.g. "POST"), `REMOTE_ADDR` (visitor's IP), `HTTPS` (secure connection check), `QUERY_STRING`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **환경 의존적 가용성**: $_SERVER 항목은 웹 서버에 의해 생성되므로 모든 서버/환경에서 동일하게 사용 가능하다는 보장이 없다는 점이 명시됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — $_SERVER['REQUEST_METHOD']로 요청 방식(POST/GET)을 확인하는 것이 폼 처리의 실전 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Checking the request method via $_SERVER (PHP):
```php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // handle POST request
}
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[PHP Tutorial]]
- **관련 개념:** [[PHP Superglobals Globals]], [[PHP Superglobals Request]], [[PHP Forms]]
- **참조 맥락:** 서버 정보 접근 — $_REQUEST 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — PHP $_SERVER Superglobal — https://www.w3schools.com/php/php_superglobals_server.asp

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