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10_Wiki/Dev/Topic_PHP/PHP_Looping_For.md

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+---
+id: php-looping-for
+title: "PHP Looping For"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["for loop", "PHP for 반복문"]
+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", "loops", "for"]
+raw_sources: ["https://www.w3schools.com/php/php_looping_for.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP Looping For]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `for` loop's three clauses each run at a different time relative to the loop body — initialization runs ONCE before anything, the condition runs BEFORE each iteration, and the increment runs AFTER each iteration — meaning changing the increment direction (`$x++` to `$x--`) alone, combined with a matching condition, is all that's needed to count backwards instead of forwards. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`for (init; condition; increment) { ... }`** — init runs once; condition checked before each iteration; increment runs after each iteration. [S1]
+- **Use case** — when the number of iterations is known ahead of time. [S1]
+- **Counting down** — reversing the increment (`$x--`) and flipping the condition (`$x >= 0`). [S1]
+- **`break`** / **`continue`** — work the same as other loop types. [S1]
+- **Custom step size** — `$x += 10` for stepping by 10 instead of 1. [S1]
+
+## 📖 세부 내용 (Details)
+- Counting up: `for ($x = 0; $x <= 10; $x++) { echo "The number is: $x <br>"; }`. [S1]
+- Counting down: `for ($x = 10; $x >= 0; $x--) { echo "The number is: $x <br>"; }`. [S1]
+- Break: `for ($x = 0; $x <= 10; $x++) { if ($x == 3) break; echo "The number is: $x <br>"; }`. [S1]
+- Continue: `for ($x = 0; $x <= 10; $x++) { if ($x == 3) continue; echo "The number is: $x <br>"; }`. [S1]
+- Step 10: `for ($x = 0; $x <= 100; $x += 10) { echo "The number is: $x <br>"; }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 10부터 0까지 카운트다운하는 예제가 증감 방향 조정의 대표 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Counting down with a for loop (PHP):
+```php
+for ($x = 10; $x >= 0; $x--) {
+    echo "The number is: $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 Looping Do While]], [[PHP Looping Foreach]], [[PHP Looping Break]]
+- **참조 맥락:** 반복 횟수를 아는 경우의 표준 반복문 — foreach 루프 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP for Loop — https://www.w3schools.com/php/php_looping_for.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP for Loop" page (Astra wiki-curation, P-Reinforce v3.1 format).