---
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).