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The Dom\DocumentType class

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Each Dom\Document has a doctype attribute whose value is either null or a Dom\DocumentType object.

Each Dom\Document has a doctype attribute whose value is either null or a Dom\DocumentType object.

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

class Dom\DocumentType extends Dom\Node implements Dom\ChildNode { }

entities: A Dom\DtdNamedNodeMap containing the general entities, both external and internal, declared in the DTD.
notations: A Dom\DtdNamedNodeMap containing the notations declared in the DTD.

Source: reference/dom/dom/dom-documenttype.xml · from the official PHP manual (php/doc-en)