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The DOMEntity class

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This interface represents a known entity, either parsed or unparsed, in an XML document.

This interface represents a known entity, either parsed or unparsed, in an XML document.

class DOMEntity extends DOMNode { }

publicId: The public identifier associated with the entity if specified, and null otherwise.
systemId: The system identifier associated with the entity if specified, and null otherwise. This may be an absolute URI or not.
notationName: For unparsed entities, the name of the notation for the entity. For parsed entities, this is null.
actualEncoding: Deprecated as of PHP 8.4.0. This has always been equal to null.
encoding: Deprecated as of PHP 8.4.0. This has always been equal to null.
version: Deprecated as of PHP 8.4.0. This has always been equal to null.

Version	Description
8.4.0	`actualEncoding`, `encoding`, and `version` are formally deprecated now because they have always been equal to null.

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