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10_Wiki/Dev/Topic_PHP/PHP_OOP_Constructor.md

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+---
+id: php-oop-constructor
+title: "PHP OOP Constructor"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["__construct()", "PHP 생성자"]
+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", "oop", "constructor"]
+raw_sources: ["https://www.w3schools.com/php/php_oop_constructor.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP OOP Constructor]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`__construct()` eliminates the need to call a separate setter method after object creation — instead of `new Fruit(); $apple->set_details(...)` (two steps), the constructor lets `new Fruit('Apple', 'Red')` initialize properties in ONE step, directly reducing the code from the previous chapter's two-call pattern. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`__construct($params)`** — a special method automatically invoked whenever `new` creates an object; name starts with double underscore. [S1]
+- **Accepts arguments** — passed at creation time: `new Fruit("Apple", "Red")`. [S1]
+- **Purpose** — dynamic initialization, replacing a separate setter call. [S1]
+
+## 📖 세부 내용 (Details)
+- Constructor-based initialization: `class Fruit { public $name; public $color; function __construct($name, $color) { $this->name = $name; $this->color = $color; } function get_details() { echo "Name: " . $this->name . ". Color: " . $this->color .".<br>"; } } $apple = new Fruit('Apple', 'Red'); $apple->get_details();`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 생성자로 이름/색상을 한 번에 초기화하는 것이 setter 메서드 호출을 줄이는 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Constructor-based initialization in one step (PHP):
+```php
+class Fruit {
+    public $name;
+    public $color;
+    function __construct($name, $color) {
+        $this->name = $name;
+        $this->color = $color;
+    }
+}
+$apple = new Fruit('Apple', 'Red'); // initialized directly, no separate setter call
+```
+
+## ✅ 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 OOP Classes Objects]], [[PHP OOP Destructor]]
+- **참조 맥락:** 객체 초기화 메서드 — 소멸자(Destructor) 챕터로 직접 이어짐(생성자의 반대 개념).
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP OOP - Constructor Method — https://www.w3schools.com/php/php_oop_constructor.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP OOP Constructor Method" page (Astra wiki-curation, P-Reinforce v3.1 format).