2nd/10_Wiki/Dev/Topic_PHP/PHP_AJAX_PHP.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-ajax-php	PHP AJAX PHP	Programming_Language	draft	conceptual		XMLHttpRequest PHP AJAX 자동완성		B	0.88	2026-07-04	2026-07-04			php programming w3schools ajax javascript	https://www.w3schools.com/php/php_ajax_php.asp

PHP AJAX PHP

🎯 한 줄 통찰 (One-line insight)

The classic autocomplete pattern splits work cleanly across the stack — JavaScript's onkeyup fires on every keystroke and sends the partial text via XMLHttpRequest to a PHP endpoint, while PHP does the actual matching against its name array and returns plain text that JavaScript drops straight into the DOM — meaning the PHP side never touches the DOM and the JS side never touches the data logic. [S1]

🧠 핵심 개념 (Core concepts)

• onkeyup event — triggers the JavaScript function on every keystroke, enabling real-time feedback. [S1]
• XMLHttpRequest — the JS object used to send the async GET request. [S1]
• onreadystatechange — a callback fired when the request's state changes; checks readyState == 4 (done) and status == 200 (success) before using the response. [S1]
• Query string parameter passing — the input's current value is appended to the request URL (gethint.php?q=" + str). [S1]
• PHP-side matching — $_REQUEST["q"] retrieves the query string; stristr() performs a case-insensitive substring search against a hardcoded name array. [S1]
• Plain-text response — the PHP script just echos the matched name(s); no JSON/XML wrapping needed for this simple case. [S1]

📖 세부 내용 (Details)

• JS trigger: <input type="text" id="fname" name="fname" onkeyup="showHint(this.value)">. [S1]
• Async request: var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("txtHint").innerHTML = this.responseText; } }; xmlhttp.open("GET", "gethint.php?q=" + str, true); xmlhttp.send();. [S1]
• PHP matching: $q = $_REQUEST["q"]; if ($q !== "") { $q = strtolower($q); $len=strlen($q); foreach($a as $name) { if (stristr($q, substr($name, 0, $len))) { ... } } } echo $hint === "" ? "no suggestion" : $hint;. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 이름 자동완성(입력 시 실시간 제안 표시)이 AJAX+PHP 연동의 대표 실전 사례다. [S1]

💻 코드 패턴 (Code patterns)

PHP-side substring matching against user input (PHP):

$q = $_REQUEST["q"];
$hint = "";
if ($q !== "") {
    $q = strtolower($q);
    $len = strlen($q);
    foreach ($a as $name) {
        if (stristr($q, substr($name, 0, $len))) {
            $hint = ($hint === "") ? $name : $hint . ", $name";
        }
    }
}
echo $hint === "" ? "no suggestion" : $hint;

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.88
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: PHP Tutorial
• 관련 개념: PHP AJAX Intro, PHP AJAX Database, PHP Superglobals Request
• 참조 맥락: JS-PHP 데이터 교환 기초 — 데이터베이스 연동(AJAX Database) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP - AJAX and PHP — https://www.w3schools.com/php/php_ajax_php.asp

📝 변경 이력 (Change history)

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