# The Dom\Attr class

(PHP 8 >= 8.4.0)

## 简介

Dom\Attr represents an attribute in the Dom\Element object.

This is the modern, spec-compliant equivalent of DOMAttr.

## 类摘要

class Dom\Attr extends Dom\Node {
/* 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 ?string $namespaceURI;
public readonly ?string $prefix;
public readonly string $localName;
public readonly string $name;
public string $value;
public readonly ?Dom\Element $ownerElement;
public readonly bool $specified;
/* 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 $textContent;
/* 方法 */
public function isId(): bool
public function rename(?string `$namespaceURI`, string `$qualifiedName`): void
/* 继承的方法 */
/* Not documented yet */
}

## 属性

namespaceURI
  The namespace URI of the attribute.
prefix
  The namespace prefix of the attribute.
localName
  The local name of the attribute.
name
  The qualified name of the attribute.
value
  The value of the attribute.

  > 注意: Unlike the equivalent property in DOMAttr, this does not substitute entities.

ownerElement
  The element that contains the attribute or `null`.
specified
  Legacy option, always is `true`.

## 参见

- » WHATWG specification of Attr

## 目录

- Dom\Attr::isId — Checks if attribute is a defined ID
- Dom\Attr::rename — Changes the qualified name or namespace of an attribute

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