How Does PHP's DOMDocument Handle Node Hierarchy and Different Node Types?

Understanding DOMDocument in PHP: Node Hierarchy and Processing

When working with the Document Object Model (DOM) in PHP, it's crucial to grasp the concept of node hierarchy. Every component in a DOMDocument, including the document itself, is a Node.

Node Types

Each node in a DOMDocument can be categorized into one of these types:

• Uppercase: DOMElement (e.g., HTML, DIV)
• Lowercase: DOMAttr (e.g., class)
• "Quoted": DOMText (e.g., "The

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