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10_Wiki/Dev/Topic_PHP/PHP_AJAX_PHP.md

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+---
+id: php-ajax-php
+title: "PHP AJAX PHP"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["XMLHttpRequest", "PHP AJAX 자동완성"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "ajax", "javascript"]
+raw_sources: ["https://www.w3schools.com/php/php_ajax_php.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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** — `$_REQUEST["q"]` retrieves the query string; `stristr()` performs a case-insensitive substring search against a hardcoded name array. [S1]
+- **Plain-text response** — the PHP script just `echo`s the matched name(s); no JSON/XML wrapping needed for this simple case. [S1]
+
+## 📖 세부 내용 (Details)
+- JS trigger: `<input type="text" id="fname" name="fname" onkeyup="showHint(this.value)">`. [S1]
+- Async request: `var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("txtHint").innerHTML = this.responseText; } }; xmlhttp.open("GET", "gethint.php?q=" + str, true); xmlhttp.send();`. [S1]
+- PHP matching: `$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" : $hint;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 이름 자동완성(입력 시 실시간 제안 표시)이 AJAX+PHP 연동의 대표 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+PHP-side substring matching against user input (PHP):
+```php
+$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).