LonghornPHP 2026

    The Dom\Document class

    (PHP 8 >= 8.4.0)

    简介

    Represents an entire HTML or XML document; serves as the root of the document tree.

    This is the modern, spec-compliant equivalent of DOMDocument. It is the base class for Dom\XMLDocument and Dom\HTMLDocument.

    类摘要

    abstract class Dom\Document extends Dom\Node implements Dom\ParentNode {
    /* 继承的常量 */
    public const int Dom\Node::DOCUMENT_POSITION_DISCONNECTED = 0x1;
    public const int Dom\Node::DOCUMENT_POSITION_PRECEDING = 0x2;
    public const int Dom\Node::DOCUMENT_POSITION_FOLLOWING = 0x4;
    public const int Dom\Node::DOCUMENT_POSITION_CONTAINS = 0x8;
    public const int Dom\Node::DOCUMENT_POSITION_CONTAINED_BY = 0x10;
    public const int Dom\Node::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
    /* 属性 */
    public readonly Dom\Implementation $implementation;
    public string $URL;
    public string $documentURI;
    public string $characterSet;
    public string $charset;
    public string $inputEncoding;
    public readonly ?Dom\DocumentType $doctype;
    public readonly ?Dom\Element $documentElement;
    public readonly ?Dom\Element $firstElementChild;
    public readonly ?Dom\Element $lastElementChild;
    public readonly int $childElementCount;
    public readonly Dom\HTMLCollection $children;
    public ?Dom\HTMLElement $body;
    public readonly ?Dom\HTMLElement $head;
    public string $title;
    /* 继承的属性 */
    public readonly int $nodeType;
    public readonly string $nodeName;
    public readonly string $baseURI;
    public readonly bool $isConnected;
    public readonly ?Dom\Document $ownerDocument;
    public readonly ?Dom\Node $parentNode;
    public readonly ?Dom\Element $parentElement;
    public readonly Dom\NodeList $childNodes;
    public readonly ?Dom\Node $firstChild;
    public readonly ?Dom\Node $lastChild;
    public readonly ?Dom\Node $previousSibling;
    public readonly ?Dom\Node $nextSibling;
    public ?string $nodeValue;
    public ?string $textContent;
    /* 方法 */
    /* Not documented yet */
    /* 继承的方法 */
    /* Not documented yet */
    }

    属性

    implementation

    The DOMImplementation object that handles this document.

    doctype

    The Document Type Declaration associated with this document.

    URL

    Equivalent to documentURI.

    characterSet

    The encoding of the document used for serialization. Upon parsing a document, this is set to the input encoding of that document.

    inputEncoding

    Legacy alias for characterSet.

    charset

    Legacy alias for characterSet.

    documentURI

    The location of the document or null if undefined.

    documentElement

    The Dom\Element that is the document element. This evaluates to null for document without elements.

    firstElementChild

    First child element or null.

    lastElementChild

    Last child element or null.

    childElementCount

    The number of child elements.

    children

    A Dom\HTMLCollection containing all child elements of this node. Available as of PHP 8.5.0.

    body

    The first child of the html element that is either a body tag or a frameset tag. These need to be in the HTML namespace. If no element matches, this evaluates to null.

    head

    The first head element that is a child of the html element. These need to be in the HTML namespace. If no element matches, this evaluates to null.

    title

    The title of the document as set by the title element for HTML or the SVG title element for SVG. If there is no title, this evaluates to the empty string.

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