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

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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-properties	PHP OOP Static Properties	Programming_Language	draft	conceptual		static properties PHP 정적 속성		B	0.89	2026-07-04	2026-07-04			php programming w3schools oop static	https://www.w3schools.com/php/php_oop_static_properties.asp

PHP OOP Static Properties

🎯 한 줄 통찰 (One-line insight)

A child class can read a parent's static property TWO different ways with different syntax for each — x::$value (via the child's OWN class name, since it inherited the static property) or parent::$value from inside a method — showing that static properties are inherited and directly accessible through the child's name, unlike static methods which more often route through parent::. [S1]

🧠 핵심 개념 (Core concepts)

• static property — declared like public static $prop = value;; accessible without instantiating the class. [S1]
• Access via ClassName::$prop — the standard external access syntax (uses $ before the property name, unlike static methods). [S1]
• Access via self::$prop — used inside a method of the same class. [S1]
• Access via parent::$prop — used inside a child class's method to reach the parent's static property. [S1]
• Direct inherited access — a static property is also directly reachable via the CHILD class name (x::$value) since it's inherited, without needing parent::. [S1]

📖 세부 내용 (Details)

• Direct static property access: class pi { public static $value = 3.14159; } echo pi::$value;. [S1]
• Access via self inside a method: class pi { public static $value=3.14159; public function staticValue() { return self::$value; } } $pi = new pi(); echo $pi->staticValue();. [S1]
• Child class access — both direct and via parent::: class pi { public static $value=3.14159; } class x extends pi { public function xStatic() { return parent::$value; } } echo x::$value; // direct, works because inherited $x = new x(); echo $x->xStatic(); // via parent:: inside a method. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 원주율(pi)처럼 클래스 전체가 공유하는 상수적 값을 정적 속성으로 표현하는 것이 대표 실전 사례다. [S1]

💻 코드 패턴 (Code patterns)

Accessing an inherited static property directly via the child class name (PHP):

class pi {
    public static $value = 3.14159;
}
class x extends pi {
    public function xStatic() { return parent::$value; }
}
echo x::$value;          // direct access via child class name (inherited)
$x = new x();
echo $x->xStatic();      // access via parent:: inside a method

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.89
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: PHP Tutorial
• 관련 개념: PHP OOP Static Methods, PHP Namespaces
• 참조 맥락: OOP 섹션의 마지막 — 네임스페이스(Namespaces) 섹션으로 이어짐.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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