---
id: php-echo-print
title: "PHP Echo Print"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["echo vs print", "PHP 출력"]
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", "echo", "print"]
raw_sources: ["https://www.w3schools.com/php/php_echo_print.asp"]
applied_in: []
github_commit: ""
---

# [[PHP Echo Print]]

## 🎯 한 줄 통찰 (One-line insight)
`print` returns 1 (usable inside expressions) while `echo` returns nothing at all — this is the functional difference behind an otherwise near-identical pair of output statements, alongside echo accepting multiple comma-separated arguments where print accepts exactly one. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`echo`** — no return value; accepts multiple parameters; marginally faster than print. [S1]
- **`print`** — returns 1 (usable in expressions); accepts only one argument. [S1]
- **Both optional-parens** — `echo "x";` / `echo("x");` and `print "x";` / `print("x");` are equivalent. [S1]
- **Double vs. single quotes** — double quotes allow direct variable interpolation (`"$txt"`); single quotes require concatenation (`'...' . $txt . '...'`). [S1]

## 📖 세부 내용 (Details)
- echo with multiple params: `echo "This ", "string ", "was ", "made ", "with multiple parameters.";`. [S1]
- Double-quote interpolation: `echo "<h2>$txt1</h2>";`. [S1]
- Single-quote concatenation: `echo '<h2>' . $txt1 . '</h2>';`. [S1]
- print (single arg only): `print "Hello world!<br>";`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **반환값 차이**: echo는 반환값이 없고, print는 1을 반환하여 표현식 내에서 사용 가능하다는 점이 핵심 차이로 명시됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 여러 문자열을 콤마로 나열해 한 번에 출력하는 echo의 다중 인자 기능이 실전에서 자주 쓰인다. [S1]

## 💻 코드 패턴 (Code patterns)
echo with multiple comma-separated arguments (PHP):
```php
echo "This ", "string ", "was ", "made ", "with multiple parameters.";
```

## ✅ 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 Variables]], [[PHP Data Types]], [[PHP String Concatenate]]
- **참조 맥락:** 출력의 두 가지 방법 — 데이터 타입(Data Types) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — PHP echo and print Functions — https://www.w3schools.com/php/php_echo_print.asp

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