---
id: php-xml-dom
title: "PHP XML DOM"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["DOMDocument", "PHP DOM 파서"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.89
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["php", "programming", "w3schools", "xml", "dom"]
raw_sources: ["https://www.w3schools.com/php/php_xml_dom.asp"]
applied_in: []
github_commit: ""
---

# [[PHP XML DOM]]

## 🎯 한 줄 통찰 (One-line insight)
Looping through DOM child nodes surfaces INVISIBLE `#text` nodes between every real element — the whitespace between XML tags (indentation, line breaks) becomes its own empty text node in the DOM tree, which the source explicitly warns "sometimes cause problems" if you're not aware they're there. [S1]

## 🧠 핵심 개념 (Core concepts)
- **DOM Parser** — tree-based; loads the whole document into memory; memory-intensive for large files; part of PHP core. [S1]
- **`DOMDocument`** — the class used to parse XML into a DOM tree structure. [S1]
- **`->load($filename)`** — loads an XML file into the DOMDocument object. [S1]
- **`->saveXML()`** — serializes the DOM back into an XML string. [S1]
- **`->documentElement`** — the root element of the loaded document. [S1]
- **`->childNodes`** — iterable collection of a node's direct children, INCLUDING whitespace-only `#text` nodes. [S1]
- **`->nodeName` / `->nodeValue`** — the name and value of each node encountered while looping. [S1]

## 📖 세부 내용 (Details)
- Load and output: `$xmlDoc = new DOMDocument(); $xmlDoc->load("note.xml"); print $xmlDoc->saveXML();`. [S1]
- Loop through child nodes (revealing whitespace text nodes): `$x = $xmlDoc->documentElement; foreach ($x->childNodes AS $item) { print $item->nodeName . " = " . $item->nodeValue . "<br>"; }` — output alternates between real elements (`to = Tove`) and empty `#text =` entries from whitespace. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **공백 텍스트 노드의 존재**: XML 생성 시 태그 사이의 공백이 별도의 빈 텍스트 노드로 취급되며, 이를 인지하지 못하면 문제가 될 수 있다는 점이 팁으로 경고됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — note.xml을 DOM 트리로 로드해 자식 노드를 순회하는 것이 트리 기반 파싱의 대표 실전 사례다. [S1]

## 💻 코드 패턴 (Code patterns)
Looping through DOM child nodes, revealing whitespace text nodes (PHP):
```php
$xmlDoc = new DOMDocument();
$xmlDoc->load("note.xml");
$x = $xmlDoc->documentElement;
foreach ($x->childNodes AS $item) {
    print $item->nodeName . " = " . $item->nodeValue . "<br>";
    // includes empty "#text = " entries from whitespace between tags
}
```

## ✅ 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 XML Parser Expat]], [[PHP AJAX Intro]]
- **참조 맥락:** XML 섹션의 마지막 — AJAX 섹션으로 이어짐(AJAX XML 챕터에서 DOM 파싱 재활용).

## 📚 출처 (Sources)
- [S1] W3Schools — PHP DOM Parser — https://www.w3schools.com/php/php_xml_dom.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP DOM Parser" page (Astra wiki-curation, P-Reinforce v3.1 format).