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title

PHP OOP Classes Objects

🎯 한 줄 통찰 (One-line insight)

$this inside a method always refers to the specific object it was called on — so $apple->set_details('Apple', 'Red') and $banana->set_details('Banana', 'Yellow') run the EXACT SAME method code, yet each object ends up with its own independent property values, since $this resolves differently per call. [S1]

🧠 핵심 개념 (Core concepts)

class keyword — defines a class with properties (variables) and methods (functions) inside { }. [S1]
$this — refers to the current object's own properties/methods within a method. [S1]
new keyword — creates an object instance from a class. [S1]
instanceof — checks whether an object belongs to a specific class, returning a boolean. [S1]

📖 세부 내용 (Details)

Class definition: class Fruit { public $name; public $color; function set_details($name, $color) { $this->name = $name; $this->color = $color; } function get_details() { echo "Name: " . $this->name . ". Color: " . $this->color .".<br>"; } }. [S1]
Object creation and independent state: $apple = new Fruit(); $apple->set_details('Apple', 'Red'); $banana = new Fruit(); $banana->set_details('Banana', 'Yellow'); — each object holds distinct values. [S1]
instanceof check: var_dump($apple instanceof Fruit); // true. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Fruit 클래스에서 Apple/Banana 객체를 각각 생성하는 것이 인스턴스 독립성의 대표 예시다. [S1]

💻 코드 패턴 (Code patterns)

Two independent object instances from the same class (PHP):

class Fruit {
    public $name;
    public $color;
    function set_details($name, $color) {
        $this->name = $name;
        $this->color = $color;
    }
}
$apple = new Fruit();
$apple->set_details('Apple', 'Red');
$banana = new Fruit();
$banana->set_details('Banana', 'Yellow');

✅ 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 What Is, PHP OOP Constructor, PHP OOP Access Modifiers
참조 맥락: 클래스/객체 선언 기초 — 생성자(Constructor) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — PHP OOP - Classes and Objects — https://www.w3schools.com/php/php_oop_classes_objects.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "PHP OOP Classes and Objects" page (Astra wiki-curation, P-Reinforce v3.1 format).

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