2nd/10_Wiki/Dev/Topic_PHP/PHP_String_Modify.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-string-modify	PHP String Modify	Programming_Language	draft	conceptual		strtoupper str_replace explode PHP 문자열 변형		B	0.9	2026-07-04	2026-07-04			php programming w3schools strings modify	https://www.w3schools.com/php/php_string_modify.asp

PHP String Modify

🎯 한 줄 통찰 (One-line insight)

explode()'s separator parameter is REQUIRED, not optional — unlike some split functions in other languages that default to whitespace, PHP's explode() always demands you specify exactly what to split on, making the split behavior fully explicit every time. [S1]

🧠 핵심 개념 (Core concepts)

• strtoupper() / strtolower() — case conversion. [S1]
• str_replace(search, replace, subject) — substring replacement. [S1]
• strrev() — reverses a string. [S1]
• trim() — removes leading/trailing whitespace. [S1]
• explode(separator, string) — splits a string into an array by a required separator. [S1]
• print_r() — displays array contents in a readable format. [S1]

📖 세부 내용 (Details)

• Case conversion: strtoupper($x); strtolower($x);. [S1]
• Replace: echo str_replace("World", "Dolly", $x); // "Hello Dolly!". [S1]
• Reverse: echo strrev($x);. [S1]
• Trim: $x = " Hello World! "; echo trim($x);. [S1]
• Explode with required separator: $x = "Hello lovely World!"; $y = explode(" ", $x); print_r($y); // ["Hello", "lovely", "World!"]. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• explode() 구분자 필수: 분리자를 생략할 수 없고 반드시 지정해야 한다는 점이 명시됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 공백 기준으로 문장을 단어 배열로 나누는 explode()가 텍스트 처리의 표준 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Splitting a string into an array with explode() (PHP):

$x = "Hello lovely World!";
$y = explode(" ", $x);
print_r($y); // Array ( [0] => Hello [1] => lovely [2] => World! )

✅ 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 String Functions, PHP Arrays, PHP String Concatenate
• 참조 맥락: 문자열 변형 함수 — explode()는 배열(Arrays) 챕터와 직접 연결됨.

📚 출처 (Sources)

• [S1] W3Schools — PHP - Modify Strings — https://www.w3schools.com/php/php_string_modify.asp

📝 변경 이력 (Change history)

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