Antigravity Agent
1cfd3bbb56
Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
72 lines
2.8 KiB
Markdown
72 lines
2.8 KiB
Markdown
---
|
|
id: php-math
|
|
title: "PHP Math"
|
|
category: "Programming_Language"
|
|
status: "draft"
|
|
verification_status: "conceptual"
|
|
canonical_id: ""
|
|
aliases: ["PHP 수학 함수"]
|
|
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", "math"]
|
|
raw_sources: ["https://www.w3schools.com/php/php_math.asp"]
|
|
applied_in: []
|
|
github_commit: ""
|
|
---
|
|
|
|
# [[PHP Math]]
|
|
|
|
## 🎯 한 줄 통찰 (One-line insight)
|
|
`rand()` accepts optional min/max parameters that fundamentally change its behavior — bare `rand()` returns an arbitrary-range random number, while `rand(10, 100)` constrains the result to an inclusive range, making the two-argument form the one actually usable for bounded scenarios like dice rolls or ID generation. [S1]
|
|
|
|
## 🧠 핵심 개념 (Core concepts)
|
|
- **`pi()`** — returns the value of π. [S1]
|
|
- **`min()` / `max()`** — lowest/highest value among a list of arguments. [S1]
|
|
- **`abs()`** — absolute (positive) value. [S1]
|
|
- **`sqrt()`** — square root. [S1]
|
|
- **`round()`** — rounds a float to the nearest integer. [S1]
|
|
- **`rand()`** — random number; optional `(min, max)` params bound the range (inclusive). [S1]
|
|
|
|
## 📖 세부 내용 (Details)
|
|
- Pi: `echo(pi());`. [S1]
|
|
- Min/max: `echo(min(0, 150, -8, -200)); echo(max(0, 150, -8, -200));`. [S1]
|
|
- Absolute value: `echo(abs(-6.7)); // 6.7`. [S1]
|
|
- Square root: `echo(sqrt(64)); // 8`. [S1]
|
|
- Rounding: `echo(round(3.60)); echo(round(0.49));`. [S1]
|
|
- Bounded random: `echo(rand(10, 100)); // between 10 and 100 inclusive`. [S1]
|
|
|
|
## ⚖️ 모순 및 업데이트 (Contradictions & updates)
|
|
소스에서 모순되는 정보는 발견되지 않음.
|
|
|
|
## 🛠️ 적용 사례 (Applied in summary)
|
|
현재 발견된 실제 적용 사례가 없습니다 — rand(10, 100)처럼 범위 지정 난수 생성이 게임/추첨 등 실전에서 자주 쓰인다. [S1]
|
|
|
|
## 💻 코드 패턴 (Code patterns)
|
|
Bounded random integer (PHP):
|
|
```php
|
|
echo(rand(10, 100)); // random integer between 10 and 100 inclusive
|
|
```
|
|
|
|
## ✅ 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 Numbers]], [[PHP Casting]], [[PHP Constants]]
|
|
- **참조 맥락:** 수학 함수 모음 — 상수(Constants) 챕터로 이어짐.
|
|
|
|
## 📚 출처 (Sources)
|
|
- [S1] W3Schools — PHP Math Functions — https://www.w3schools.com/php/php_math.asp
|
|
|
|
## 📝 변경 이력 (Change history)
|
|
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Math Functions" page (Astra wiki-curation, P-Reinforce v3.1 format).
|