2nd/10_Wiki/Dev/Topic_PHP/PHP_OOP_Static_Methods.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
php-oop-static-methods	PHP OOP Static Methods	Programming_Language	draft	conceptual		static keyword parent:: PHP 정적 메서드		B	0.9	2026-07-04	2026-07-04			php programming w3schools oop static	https://www.w3schools.com/php/php_oop_static_methods.asp

PHP OOP Static Methods

🎯 한 줄 통찰 (One-line insight)

Calling a static method from a CHILD class requires the parent:: keyword instead of the class name, even though the static method literally belongs to a specific class — this differs from calling a static method from an unrelated class (which uses the explicit class name like A::welcome()), showing parent:: is reserved specifically for the inheritance relationship. [S1]

🧠 핵심 개념 (Core concepts)

• static keyword — creates a method callable WITHOUT instantiating the class first. [S1]
• Access via ClassName::method() — the standard way to call a static method from outside. [S1]
• Access via self::method() — used to call a static method from a non-static method WITHIN the same class (e.g., inside a constructor). [S1]
• Cross-class static calls — a static method must be public to be called from another class's method. [S1]
• Access via parent::method() — used specifically when a child class wants to call a static method defined in its parent. [S1]

📖 세부 내용 (Details)

• Direct static call: class greeting { public static function welcome() { echo "Hello World!"; } } greeting::welcome();. [S1]
• Static call with arguments: class calc { public static function sum($x, $y) { return $x * $y; } } $res = calc::sum(6, 4);. [S1]
• Static called via self from constructor: class greeting { public static function welcome() {...} public function __construct() { self::welcome(); } } new greeting();. [S1]
• Static called from another class: class A { public static function welcome() {...} } class B { public function message() { A::welcome(); } }. [S1]
• Static called via parent:: from a child class: class domain { protected static function getWebsiteName() { return "W3Schools.com"; } } class domainW3 extends domain { public $websiteName; public function __construct() { $this->websiteName = parent::getWebsiteName(); } }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 상속 관계에서의 특수 키워드: 자식 클래스에서 부모의 정적 메서드를 호출할 때는 클래스 이름이 아니라 parent:: 키워드를 사용해야 한다는 점이 강조됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 부모 클래스의 protected static 메서드를 자식 클래스 생성자에서 parent::로 호출하는 것이 실전 활용의 대표 사례다. [S1]

💻 코드 패턴 (Code patterns)

Calling a parent's static method from a child class (PHP):

class domain {
    protected static function getWebsiteName() {
        return "W3Schools.com";
    }
}
class domainW3 extends domain {
    public $websiteName;
    public function __construct() {
        $this->websiteName = parent::getWebsiteName();
    }
}

✅ 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 Traits, PHP OOP Static Properties
• 참조 맥락: 인스턴스 없이 호출 가능한 메서드 — 정적 속성(Static Properties) 챕터로 직접 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP OOP - Static Methods — https://www.w3schools.com/php/php_oop_static_methods.asp

📝 변경 이력 (Change history)

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